Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f47a71bcdbe489…

MALICIOUS

PDF

83.2 KB Created: 2021-03-29 15:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eff0aca1ca60b98951c66806de3159a4 SHA-1: e74f9c2c25fad195e78daf0a743f7764982f4fe4 SHA-256: f9f47a71bcdbe489490ac66d3f02f3130398980e3896a71c08458f8ad0045140
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 0.9997

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://botokaw.ru/strik?utm_term=books+in+order+dean+koontz PDF link annotation
    • https://cdn.sqhk.co/xuvuxemoguf/nXEjehh/parrot_voice_recorder_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/bzicSgd/75278136366.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/1tJjcif/93197506458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_60161662afad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_605f662ae5663.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/ge6jfhj/project_manager_resume_examples_australia.pdfIn PDF document text
    • http://dazavaluk.mygamesonline.org/xewusatekarazilimiledeso.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/Mr5ib3n/77994565481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fd912a28847c.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/Ije1tjg/android_room_database_update_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_602f957540f9d.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/can_i_use_my_phone_as_a_remote_for_a_non_smart_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_601516b459ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_6045ca12e73c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_c57eb25deb7b4c71b46a2dad37b3d51c.pdf?index=trueIn PDF document text
    • http://rususekobijo.myartsonline.com/xumak.pdfIn PDF document text
    • http://laxufazekez.atwebpages.com/una_canzone_d_amore_testo.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_500412fb3c3d4dbb82113e4f89b88030.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_c9ed7420b96e4d13aaa2da7dc82b72e2.pdf?index=trueIn PDF document text
    • http://tosipasakuvil.myartsonline.com/class_11_biology_chapter_9_notes.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_65816de6ded84b248e98f3447f07ed5d.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_df7b3514ac174e3e97afda479c941a1a.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_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 4952 bytes
SHA-256: de09957e91aeb072afef7a1577f681403b13fddc221091d9f86b9e446e781309
font_01_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 11300 bytes
SHA-256: 909ae2069a7ab222b880d50cdd001db5f39b96d8c9397ba535ccd8459615bee4