Malicious PDF — malware analysis report

Static analysis result for SHA-256 568bfaf73994979e…

MALICIOUS

PDF

85.1 KB Created: 2021-03-29 18:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d2820c862d8645d54edc9c494ad0b1a9 SHA-1: 7720370504d8a200a4fa99bb468d901a3f9ebd56 SHA-256: 568bfaf73994979edacd51e60524467f6ec47f528573622f84ce2df7d2fbe3f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked content. No scripts were extracted, and the document body is heavily obfuscated, preventing a more detailed analysis of its specific lure.

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://xezojetit.ru/award?keyword=you+can+t+hurt+me+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447915/normal_6009e8d13961b.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/h0l8hcK/pabilojategina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_6028c453bc298.pdfIn PDF document text
    • http://ouily.xyz/genie_2042_sprocket_replacementxwuoy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fe9539b6d476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_6030e6b69f4a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_602a8b406fe6d.pdfIn PDF document text
    • https://cdn.sqhk.co/logenuzupug/ihdQvS7/airpods_driver_windows_7.pdfIn PDF document text
    • http://opensalle.xyz/tibetusakajumucpex7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477623/normal_5ff64a51e9711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_5fd95f2418129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_600c3b00daac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fd201bfae74b.pdfIn PDF document text
    • http://nesobaka7.xyz/javogavurefoxufiu2bb6.pdfIn PDF document text
    • http://blekrossi.ru/678126161926s2kf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_79578095f6964e79a28b99c1f9dd8ae5.pdf?index=trueIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_dcfb0b1344314328977b50a1212a8062.pdf?index=trueIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_8c61eb4179ae46fbbad4750ec09aa2d9.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_9810bd7bf0014ceabb0b01459a6dfad0.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_f9577120a5c34ab8a99b6830bdee7ef7.pdf?index=trueIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_f1fda92818ad4075b5d5feae5ac6f373.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_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 5352 bytes
SHA-256: 5cd751b1b3dfc37987066d96bb8adbdd75e86473242d6dc92cdf66b8aaaaa820
font_01_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 11884 bytes
SHA-256: e51fef3ffa5518ce09ea1dec8bfeb0fa070ace327d269dc3bc294eaa5576cda3