Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85ae39d52d15538…

MALICIOUS

PDF

72.8 KB Created: 2021-03-28 10:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7f7b1d9348285b661ca8c062bdc969da SHA-1: 5635b85cc541a60b032cdb6f9a4d14bc843a5cc3 SHA-256: f85ae39d52d15538acd1c36151fddc1559550545d6394d297c5b29a0ab0806ce
186 Risk Score

Malware Insights

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

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 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://seumenha.ru/123?utm_term=casal+raiz+musica PDF link annotation
    • https://kemebawe.weebly.com/uploads/1/3/5/3/135313751/de9c2959f.pdfIn PDF document text
    • https://wofudanizosaxig.weebly.com/uploads/1/3/1/6/131637209/49226903e40.pdfIn PDF document text
    • http://gogogoinst.xyz/audio_libro_dador_de_sueos5zbuk.pdfIn PDF document text
    • http://policyhelpcenter.com/best_raymond_chandler_short_storiesgg3je.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_600f1b3dc2f78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_605cab66e4306.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/brush_lettering_with_kelly_creates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_6048f7362c325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_605b7ecff29ef.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/3906140.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/xararanifanudidexa.pdfIn PDF document text
    • http://table-wait.com/best_android_adventure_games_2017_offlinee27sn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5fe4420116233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugezirux.epizy.com/68138806688.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_9bd45d393f50495c9c3f1f48374ea87d.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_6e500e9d81a94733bc0d0482cb68746d.pdf?index=trueIn PDF document text
    • http://jafojib.rf.gd/bokubiriwutixa.pdfIn PDF document text
    • http://mevutaleb.epizy.com/longman_exam_dictionary.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/algebra_questions_year_6_sats.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_9da6a31dcfe645e1a7b627b49aa3df93.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_e604adc92357443b9e9d7757ec8071f9.pdf?index=trueIn PDF document text
    • http://fugufaza.myartsonline.com/duzogixojupunelukagizili.pdfIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_5e788c78bdf74c80ab0b460e8ca006b2.pdf?index=trueIn PDF document text
    • http://povodakav.myartsonline.com/stored_procedure_in_sql_tutorial.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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 4900 bytes
SHA-256: 90178750ba9e0c4e956eec56e65d2b7dc2b825bd998a718f7c7bc882eaa5dec8
font_01_sfnt_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 12168 bytes
SHA-256: 9f8161c949dd1af5847593b634c35f89b35c66713d5d8f75411fc36516d68d6d