Malicious PDF — malware analysis report

Static analysis result for SHA-256 6771e183424df2cd…

MALICIOUS

PDF

74.6 KB Created: 2021-03-22 09:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea3b4b69386a0d9b78aad404807a0753 SHA-1: 9d5bafe50eb7cc76fea116892b27173523aee4ec SHA-256: 6771e183424df2cd35464cfe2c4f8a8069f4bfedfd4d541a2f260a7bb381b34c
246 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. It uses brand-impersonation credential phishing. 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 0.9992

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/dojuzepawet_gurunisek_xozalibowu.pdf.
  • 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://leonvi.ru/wix?keyword=yamaha+big+bear+350+repair+manual+pdf PDF link annotation
    • http://xxlmature.site/setting_of_the_story_the_destructorsdxq7s.pdfIn PDF document text
    • http://izzzaaa.space/geant4_users_guide_for_application_developerspy6bo.pdfIn PDF document text
    • http://okclub.org/9616587414vvp50.pdfIn PDF document text
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/dojuzepawet_gurunisek_xozalibowu.pdfIn PDF document text
    • http://m-ryanaf.site/tesis_energias_renovablesk9vx7.pdfIn PDF document text
    • https://kasureketox.weebly.com/uploads/1/3/4/8/134856927/bee3c46.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/8352519.pdfIn PDF document text
    • http://julapekawej.22web.org/21638284558.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/ca27f2f25b06fb.pdfIn PDF document text
    • http://kushtanash.ru/831996318328bn22.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/pobufovitelara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_0bf63253fcec4163ab76f77d0dfcce64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6594df30-cf07-46b8-ae6e-e019b175df57/68955912011.pdfIn PDF document text
    • http://rulakilelakeze.epizy.com/nagedodivesafebapikirafoz.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_bb7ad6c5d9ef47419ac9b60bd83d9f02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aed3c90-2db0-4802-a9b4-9689033ce8e6/xawekodujaxujukagesura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743814ca-014f-4b7e-bf08-adec2201a84c/mosbys_2020_nursing_drug_reference.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_07452a852fc440d6a4c08eeb8f7a7010.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_2fbac267af6a4c108350d0ea2004f02e.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_a983be15e8f14619b4e46e04b98876ad.pdf?index=trueIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_16051406f14e493d8d5c835377c397db.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_439db1a2e6cb4c29addc68dd76c000e6.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_c11be72903b941ee85a1a271026e38f2.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_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 5808 bytes
SHA-256: e3471df600d71d21ca97a540d77d3ca8322ae41c6f2984734b025d1620fa7ef2
font_01_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 10528 bytes
SHA-256: 13e5d8129b8b4d7ccec2cc0e730851398532ede316a1dcc7812bb09c931719fd