Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bd3bfe78f22672…

MALICIOUS

PDF

75.1 KB Created: 2021-06-06 16:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f5b987f10f58cd0d19cfe1848ea7ae0 SHA-1: fda57ad8a86c631eb753338ce9e0d22d66a0d3b7 SHA-256: 82bd3bfe78f2267272aca8ed365ce0759fcd1cb419398874ebdc38827992e5a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/pbw?utm_term=simple+past+reading+comprehension+worksheets PDF link annotation
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/7629693.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370555/normal_60afe7a4df158.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/zewezitiwobaxigew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5fd306e7532e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5fcc54654ee42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_60230a6433175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_606793d270552.pdfIn PDF document text
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/9651228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5fec6761494e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_6000a696cecec.pdfIn PDF document text
    • https://lafawifovetin.weebly.com/uploads/1/3/4/3/134369932/rikodizuzerebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_5fdaebe1b6eed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5fff6a9eb2efa.pdfIn PDF document text
    • https://faruxolumapegi.weebly.com/uploads/1/3/5/3/135341403/tidatajag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_6035002e2b3ff.pdfIn PDF document text
    • https://pezibufanijazox.weebly.com/uploads/1/3/4/6/134639202/ruxomenubifejew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5fef709d6dfeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_6058bdd1304c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_60ba902282326.pdfIn PDF document text
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/jusutedetorifu_tutogubadug_julasi_wewadofiz.pdfIn PDF document text
    • https://vifoxofanope.weebly.com/uploads/1/3/4/6/134670603/f1528c0.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/038fe2be-0cc5-49d5-9e7d-5a4dd8cb01b8/english_speaking_lessons_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9605fd-3fc1-48e7-a931-64c53e2f97fe/90717500651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0cc093-cdaf-411f-a844-a06ecf42de2c/xotaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa94efcc-a6d9-421c-9cd7-efdac9caa287/inspiron_3847_motherboard_size.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_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 5748 bytes
SHA-256: 9b205fac7570f47a1299885dae6d6e96690ea44e4eaf1916f9f3f1a305cdde7e
font_01_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 10544 bytes
SHA-256: 16d44c02519ab3f6d010d74106f66220505f07e353f78d7d8e72b4739dfeb3e7