Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa79f8a718c485b7…

MALICIOUS

PDF

77.3 KB Created: 2021-05-18 12:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 62ad1ac1a9997e175a2ce4c4d8ab0d16 SHA-1: 20425c1ed8690dbb8745f00c166c4ca7259d4b7e SHA-256: fa79f8a718c485b785a2fe6ec547b1816f0dd81b0124eb58b2c18cbaffc9520e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/strik?utm_term=western+civilizations+brief+4th+edition+volume+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403282/normal_602558bf43b34.pdfIn PDF document text
    • http://witejafekomip.22web.org/29392278301.pdfIn PDF document text
    • https://wopulatizu.weebly.com/uploads/1/3/4/3/134348797/9a0ac783cbb.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/9af4f4621250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_60418134df653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_6054956040702.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408598/normal_5ffca534f386a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_602c12ed74963.pdfIn PDF document text
    • http://zemegulobeka.iblogger.org/attestation_sur_l_honneur.pdfIn PDF document text
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/gebasinedojidewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_601047a339de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5ff1d1f24a6c0.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/17061206646.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/5c7d1d88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_600813f04becc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_6018de0839017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_60170d357a837.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/5814253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jafigufukuwixo.rf.gd/biology_class_9_notes_download.pdfIn PDF document text
    • http://bebezira.epizy.com/weather_report_live_kolkata.pdfIn PDF document text
    • http://fapuvonez.epizy.com/criminal_law_by_estrada.pdfIn PDF document text
    • http://xofiketur.rf.gd/romapawabamerinabevamuja.pdfIn PDF document text
    • http://fusezumapaj.epizy.com/best_grammar_and_plagiarism_checker_free.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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 5744 bytes
SHA-256: 1ff20a94e8e83561dfd45e3e210d65303858ab6fff8cbbf6864a7fa616ed0a02
font_01_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 11000 bytes
SHA-256: 3cd2d34fec8e76f36d1e56378d1982728f0c6be0e4eb1201a11dc5b5e613959c