Malicious PDF — malware analysis report

Static analysis result for SHA-256 a474c5e3fb7e004e…

MALICIOUS

PDF

78.6 KB Created: 2021-05-12 14:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: dcd0e7bd456d8acda73178b636da1518 SHA-1: 2e11a5e59f1db264327d049e3504c58c6abf44cd SHA-256: a474c5e3fb7e004ef9a98f450c147fcf70eb577b31676191501217e0ff13ea49
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL being zajinet.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=the+maze+runner+story PDF link annotation
    • https://cdn.sqhk.co/figakeves/zijR6mk/70972100988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_6020b8294066c.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/hJiigWd/kung_fu_panda_toys_online.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/4759914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467004/normal_60446e21626f8.pdfIn PDF document text
    • https://bizuzekibokosu.weebly.com/uploads/1/3/4/4/134446479/sadiloxekafafajuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/gfKfdsL/66288096496.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/idhejjT/rewamabaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_f7e445e6afea44ecb6dd50b82eb1a999.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_45a71484ee0a499c93df08c2f1b79239.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_919e249c30a34a1289b622d2424d15de.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_b12b7502c5ac418ba29aac9d70c0fda1.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_b7fd28e8f9fe45ca90154de1491670d7.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_468b331ef52c422185de3d64ce6df900.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_e14f6d76a3654236b4d02770f297242b.pdf?index=trueIn PDF document text
    • https://4e16d9da-0927-4957-8a4e-4544605d6055.filesusr.com/ugd/d7e550_6d4fa266d2d649f29efc2757bc5bfea8.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_81d09711af8244a09872ccee0affc4ee.pdf?index=trueIn PDF document text
    • https://2634c7da-0b58-4de1-95e3-ef2217a723ee.filesusr.com/ugd/f934bc_d35f5a2e1f9b468cbf6671c0a9e34e3b.pdf?index=trueIn 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_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 4992 bytes
SHA-256: 011ffa19425df746c01e3aaa33caa61dd254e4017bbd94cf24cf804f247c8501
font_01_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 11000 bytes
SHA-256: 36fafe024aea78d041c3e18c705b38be32a36669a14124eda5649a8b78f6b633

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