Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0672d7b0b63e1f6…

MALICIOUS

PDF

98.5 KB Created: 2021-04-05 12:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4b4411d9e80d27d8c57173f7f4aa485d SHA-1: 361c9c651443b38c0ab483845abaeab8f60a8d46 SHA-256: f0672d7b0b63e1f6e4566ea83562fc2f0169ac4c24e068c6fd5fb913e4a21ee3
226 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 a password-protected-archive lure. 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 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/strik?utm_term=is+the+2020+invisible+man+a+remake PDF link annotation
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/popefir-rixep.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/39249751297.pdfIn PDF document text
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/vufibaxufuridafozazi.pdfIn PDF document text
    • http://ruvikuvi.mywebcommunity.org/sedgewick_algorithms_in_java.pdfIn PDF document text
    • https://sokijaxojo.weebly.com/uploads/1/3/5/4/135400829/6818021.pdfIn PDF document text
    • http://lovefoxesi.iblogger.org/how_to_fix_grandfather_clock_not_chiming.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/is_fl_studio_20_free.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/79380112180.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/punctuation_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/mcgraw_hill_wonders_2nd_grade_grammar.pdfIn PDF document text
    • http://guziruxasa.epizy.com/wejajixavu.pdfIn PDF document text
    • http://jaxages.epizy.com/51522577686.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_2055af4f78dd43f5ac2b57ad73dcf21f.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_a64f6c39068742ff98cbdeef007e3804.pdf?index=trueIn PDF document text
    • http://kodukodurefijub.rf.gd/castor_bean_farming.pdfIn PDF document text
    • http://gafelen.epizy.com/maniwejelagot.pdfIn PDF document text
    • http://nanesipub.rf.gd/katidulabanesunuzer.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_off00014111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14111 5400 bytes
SHA-256: 83a816b794c1e434a4f691fc4f316886769c436cda729eb3ffebeb2bbfe01d6f
font_01_sfnt_off00015343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15343 12324 bytes
SHA-256: 4aacca345101c393e7d251f17558ad978e7a49a31c991e38437c866c288af357

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