Malicious PDF — malware analysis report

Static analysis result for SHA-256 919cd5ab2c5f17d0…

MALICIOUS

PDF

72.6 KB Created: 2021-02-28 07:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 604d894dcc9e34a046383f8d721dad41 SHA-1: 83c4139219f1dcde1e21ac215cb2aea75ac6bb86 SHA-256: 919cd5ab2c5f17d03497121a7d030be370a5ea3a40eb8e2577b821a36390a186
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://zajinet.ru/123?utm_term=nigerian+navy+slang+words PDF link annotation
    • https://xemupawiked.weebly.com/uploads/1/3/4/3/134321325/7b262ab02e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445573/normal_5fe1a729445a2.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/899fa283d7187d.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/jgighMe/marble_run_2d_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_6015f2d14259f.pdfIn PDF document text
    • https://xesusesubo.weebly.com/uploads/1/3/4/3/134348975/mapibokog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wofaxil/42599714751.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/aphis_pet_travel_7001_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/formatting_sql_code_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/vigizuga.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/63785747783.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/html_website_design_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/citations_chicago_manual_of_style.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/anaemia_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/52411445587.pdfIn PDF document text
    • http://dofusuzi.epizy.com/jamafiwedivupilinegomas.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_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 5216 bytes
SHA-256: 7f5e2155682d2e3483bf7473e29833d94d1b91b31ba7faa634944b8a60321afb
font_01_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 11136 bytes
SHA-256: 8cc5a21399f52eebe71bb952568bdf49115f163b334c4059a4e4e1aa6d335196

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