Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e693cb449e5842…

MALICIOUS

PDF

92.3 KB Created: 2021-05-28 23:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4edc5f17e8dde828f7d59f657be01da5 SHA-1: e1262542d641b60d8fbb85e184384b98a060cc76 SHA-256: a4e693cb449e5842a10287f337a4276000eae962ff15aca37ad3d8281c81d1b0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/strik?utm_term=applebee%2527s+employee+handbook PDF link annotation
    • https://xufuluzigi.weebly.com/uploads/1/3/4/2/134266078/2858051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_60599ce3165af.pdfIn PDF document text
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/7340161.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/a004a5c7.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/a1cac14.pdfIn PDF document text
    • https://buvurowu.weebly.com/uploads/1/3/4/6/134638295/mogudumekuweno-bolidi-tesipigerim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423460/normal_5ffaad67a38ef.pdfIn PDF document text
    • https://bulasekujamur.weebly.com/uploads/1/3/4/3/134377464/raloxepifusizuf_muxatukege_mebot_piwigabib.pdfIn PDF document text
    • https://pobexapuze.weebly.com/uploads/1/3/0/7/130740180/cac02ece6c6.pdfIn PDF document text
    • https://satatemusuk.weebly.com/uploads/1/3/4/3/134311800/5bbdec4aa81e.pdfIn PDF document text
    • https://wiwoxedanin.weebly.com/uploads/1/3/4/0/134012493/binivojifegoke-lojilo-gitoxasavatuja-vinozusunonejul.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/3755105.pdfIn PDF document text
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/06f2e70622e8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464527/normal_5ffbf1b29badf.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/17a5e747-ccec-482b-bbba-91a77499b756/44666377528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef487bf-7719-4cac-89b9-abb774126ab8/brookstone_outdoor_speaker_how_to_connect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9793bd-c31a-4b81-95db-a08a081128ff/dnd_4e_feats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13e6fdd-bb07-4963-97cc-3ed4dd10c78a/goodwill_drop_off_around_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4aeb638-3166-4297-b114-75ce7fa6ac64/windows_10_pro_64_bit_product_key_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dad11ee-05e1-4fcb-987c-cef30de3a6da/kenmore_washer_wont_spin_or_agitate_just_buzzes_hums.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b01e5b-a832-42e8-91f5-7b7f109ec786/nuferimovow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad33816-90a2-43fc-9464-970e00bee586/48391507325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c930433c-2e9b-42ab-9221-29c7fa82c264/mivibaribotudufitutawadux.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 5432 bytes
SHA-256: 1cbf88205cb72a1875b3454b0d641c41e03a507eea4b59f9929f65ab59abf2d4
font_01_sfnt_off00013752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13752 13880 bytes
SHA-256: 9694e77e41b01da232b2240970f6d4c51591c6030af604ffbdf94c361cc1324f

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