Malicious PDF — malware analysis report

Static analysis result for SHA-256 64725e148b835536…

MALICIOUS

PDF

76.0 KB Created: 2021-05-26 22:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00051919d7adaf43c935c538243a7c8e SHA-1: 195f59222b4aea2c7dc1b93dc27cdbf4b361cf87 SHA-256: 64725e148b835536424ce9c60d682e548590a79e529b2275afdda54bd77e778b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm for SEO manipulation or traffic generation. One of the extracted URLs, https://nipisod.ru/wb?keyword=ti%2084%20plus%20ce%20charger%20adapter, appears to be a primary destination for such traffic. No scripts were extracted, but the PDF structure and link farm heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wb?keyword=ti%2084%20plus%20ce%20charger%20adapter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386594/normal_604d797540320.pdfIn PDF document text
    • https://vugijivanapuxa.weebly.com/uploads/1/3/4/7/134742443/5dd49735df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486344/normal_60195a9a40f50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450625/normal_5ff2be4e38e6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469638/normal_606199cedab1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_5fdb52853a524.pdfIn PDF document text
    • https://kinofipu.weebly.com/uploads/1/3/4/7/134725163/liridogesuzub-gerixo-dipopi.pdfIn PDF document text
    • https://puxekubokoru.weebly.com/uploads/1/3/4/6/134683715/2893577.pdfIn PDF document text
    • https://degepuwenezeg.weebly.com/uploads/1/3/1/6/131607310/sejuxenigerozel.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/debodunev.pdfIn PDF document text
    • https://zapokeboxopi.weebly.com/uploads/1/3/0/7/130776852/lozetaviraw-sugitof-powidubekufita-segudujito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5fe229af7414a.pdfIn PDF document text
    • https://bafafodalub.weebly.com/uploads/1/3/4/3/134367540/ebc045c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e277a8e4-f26a-4f7e-a84f-de3a44fc9ab2/sims_3_macbook_air_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9d84f7-2315-4f42-9852-254477fc3d41/simcity_4_deluxe_edition_download_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668ff607-8e50-4a32-8a2b-bea2fe60a213/kajakexalavobuzizuzomok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4121b8f6-677e-412a-944f-639ef3282b27/46387408927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e8e8cd-92c0-4e46-8818-ac45038428c1/how_do_i_connect_directv_to_internet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b303b0f-fe36-4559-9282-6ca5ccbfefa9/44703987743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0d48c7-e0a1-474d-a547-ba4be2df7d36/33658379589.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 5564 bytes
SHA-256: 13f70ded107e56bc291a455f5974e83b8616fb2c7165a3770d52d9a5731f7fdc
font_01_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 11188 bytes
SHA-256: a5c87c2b303bddec6c96b7f0ebd63218e86b6832e175fedc80adbef625ad266e
font_02_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 16200 bytes
SHA-256: 5f946e864a0084c1581cc0a601af2a2047e7238f5e4d6d2b189e3f2e46a941a7

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