Malicious PDF — malware analysis report

Static analysis result for SHA-256 edba95652935aa8a…

MALICIOUS

PDF

69.1 KB Created: 2020-12-09 18:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9f9b23e47ad37cc84955b25cf834679d SHA-1: 9bd57d3d4f6ec4ce1cb63169f394301bf126d91e SHA-256: edba95652935aa8a5b6d072d7f95749d9c962c3ab6d915f7daa40ccbec3be1a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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 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://traffset.ru/strik?utm_term=causes+of+the+end+of+the+cold+war+essay PDF link annotation
    • https://zazukorowoko.weebly.com/uploads/1/3/4/4/134488568/1010120.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/af82b69e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f9e9649b227c.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/6707404.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/afbf51236a71.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/d1fc09dbf.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/fivubuxe_teniziputi_tajudin_nazugav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf623c7acac6192ab8bddd/1606378044707/sanskrit_boy_names_starting_with_n.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3393e18c5c478ec64db9/1606300563813/inductive_reasoning_math_word_problems.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd299dcb8e252b353df89b/1606232478336/89562545919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b80b0f6-0e79-4cc4-9a79-ffa40e481a64/wasefoluxuxudimojorib.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33d29405d5340f338d172/t/5fcf222c14319a51dc2b3bdb/1607410221164/73654266994.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_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 5208 bytes
SHA-256: e03745f7c490903eac713f16c0ecbc1008dcbcfe246549411a1e7fd57fcbbf5c
font_01_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 11496 bytes
SHA-256: b0efb5f723144de562ddd24cc16579140335fc4ba23be6ccc57667701115ead5

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