Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b94fc6277ba41f1…

MALICIOUS

PDF

79.3 KB Created: 2021-04-08 06:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c7b9b5e55c5eec62fd53076f9f0a262f SHA-1: df3e8c40d348b40d2f8700535c2cfccccd37a4fe SHA-256: 3b94fc6277ba41f13c44d18bfe598661c37864d4f1b44823c46dd1c76fd6deb6
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 0.9990

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://baarspo.ru/strik?utm_term=what+is+after+we+collided+about+movie PDF link annotation
    • https://cdn.sqhk.co/ruvonusebex/RGjeYUW/71794150626.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/hhRrge4/gejetir.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/j0jigjF/39210890748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_5fdb2a5c8ae4b.pdfIn PDF document text
    • http://jufukumodubaxuv.iblogger.org/exercises_to_improve_pronunciation_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_6041861c2a23b.pdfIn PDF document text
    • http://xofezibukironex.iblogger.org/digitech_rp500_manual_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_604326849ffb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fe2476f9410f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_6060a28eab885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_604ed7ef38072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426687/normal_5ff96bf7035af.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/ijxOhAm/bubble_tea_pearl_maker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_60496cd3d4304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_579048cf477045968d546f3b74900980.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_aee73c9edaa1453b82f89defc0cb96b8.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_d0a089264af7417bbf0e732e35d70478.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_e2edf8faab6f46dbb6e463f6231bfb54.pdf?index=trueIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_419cfb35aa274a07b40d4405fb5e66a9.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_016d5eba8ee84b15a32e3ba2568eeadb.pdf?index=trueIn PDF document text
    • http://tibupud.epizy.com/vazoxenep.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_430a4133b9f447039e2f4978c7cf6ef6.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_96e6c4ba75014481bd9ec66fe3c76145.pdf?index=trueIn PDF document text
    • https://a4078cf6-8fa3-420b-ab61-258487076e43.filesusr.com/ugd/a3907e_c9f2134afce14791827fd3cba2606380.pdf?index=trueIn PDF document text
    • http://budapetag.epizy.com/bonhomme_allumette.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_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 5568 bytes
SHA-256: 7d3d92838daa86911dfcfe6be9cdb5b421cc99ace394ae6bdcdc299bf99c066c
font_01_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 10760 bytes
SHA-256: b2f0d7010607154dbbb9d743cad679355ab657f2c0bc343929f369c8bcb98aa3