Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac26527431a238d…

MALICIOUS

PDF

74.6 KB Created: 2021-01-12 11:38:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bc06d1365a8888afbdf0f9e0cd9d7d50 SHA-1: 044bf41cf6390b0f4ee8469e3891c62e36399187 SHA-256: 9ac26527431a238d8cd0e8ffaa4efe824a56cda6640f89f28bc277a9da540fdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://traffnew.ru/aws?utm_term=my+cellebrite+s PDF link annotation
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/2900bb787da7eb0.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/f7f3d1225a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_5fd64b156dd35.pdfIn PDF document text
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/buwikedokirurame.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/difuxuba-gikenelitagub.pdfIn PDF document text
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/fosulepijujunotifed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484639/normal_5fc85eb58718d.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/aiqhjcW/captions_for_pool_pics_with_friends.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/vizegemawokaxe/nokuwanolebakuzosotediwot.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/newsletter_design_template_html.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 4832 bytes
SHA-256: b2f72d5b68014b77b9c2d7492decec22df23d3abf897f00c7fa4f6eb12d7fe0a
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 11212 bytes
SHA-256: 71d5edb4732d8085576dfdcc74cfc1dfc6bc613a55a949240880ddddf8453c5c