Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ef8f989766b850…

MALICIOUS

PDF

89.6 KB Created: 2021-06-05 23:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1ca0c0c8a6e0cd7272210ed561f9786d SHA-1: 2307e378f505961aa5c58911a104d177d56e4673 SHA-256: c4ef8f989766b8500466c586dd9ab76bcaac5f92185f79558768f35918811f03
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/pbw?utm_term=kehne+ko+jashne+bahara+hai+song+download+320kbps PDF link annotation
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/xorebodef_pudisazuro_xobomuminumek_sixafaduxafezoz.pdfIn PDF document text
    • https://pulipelese.weebly.com/uploads/1/3/4/6/134686308/87307c0f.pdfIn PDF document text
    • https://bikarulag.weebly.com/uploads/1/3/5/3/135313840/kifiviwaf_sipewir.pdfIn PDF document text
    • https://daxozeke.weebly.com/uploads/1/3/4/3/134322415/7847bddf366e0af.pdfIn PDF document text
    • https://zetakopazo.weebly.com/uploads/1/3/5/3/135351561/575a4043cfa.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/newasi-bavasugidepulok.pdfIn PDF document text
    • https://nitatodija.weebly.com/uploads/1/3/4/0/134012345/zikurojexumamuze.pdfIn PDF document text
    • https://nuwukovodikala.weebly.com/uploads/1/3/4/6/134666266/kekaka_jenikag_wuzuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://juwelite.pbworks.com/f/35399441158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1047ad54-1d4b-4116-b123-b9152c6237c5/romeo_y_julieta_reserve_corona_en_tubo.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/84435621606.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144573696/pajij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b7b7aa-2fd4-4f51-a53d-5a3f531ec91d/how_much_do_med_surg_travel_nurses_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ae794f-4a7c-4660-a430-0a9a7b81a0cd/73769382516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd619031-4f79-4ef2-b2ce-a5230da1bd61/how_to_spot_a_fake_drivers_license_philippines.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144427734/bipaveneka.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/creepy_nights_at_freddys_1__android.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144420297/minna_no_nihongo_textbook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9d6f72-0f05-4853-a553-9c3fed8c65e7/what_does_limited_service_broker_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc17ff7e-8596-481c-ab8c-518c7911b0c7/8622490048.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/the_interview_1998_explained_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6def67-f9c9-462f-aa7b-36b5387daccf/lazuwanonumidudonawiri.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/lisezokepore.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144559023/how_to_reset_iphone_6_plus_with_passcode.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/26819070707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2862cbb-3480-40e4-842a-3baf47817cd5/58789956918.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 6000 bytes
SHA-256: d622506d299042386bd71238a91b0174139ba1643db60ddca4ad3ab78743b72e
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 2044 bytes
SHA-256: e8def34ef7fa1cd1e737aa53281a1ad4be732a20e453453846aa670fb207f4af
font_02_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 13300 bytes
SHA-256: 2e71c1e64dd3425bf7f4121274654612671664e27c9b1922a0c147aa64b95032
font_03_sfnt_off000135ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AE 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_04_sfnt_off00014ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB2 3240 bytes
SHA-256: 70a1da19c190a767166b02af35e15880fd9692fb63832a98fcc70548ec391314

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