Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ec9d21987764d6…

MALICIOUS

PDF

137.6 KB Created: 2020-12-28 18:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ceb03d206bd859bf91f7c076147a3747 SHA-1: fcb55d5c56cd67a984d1747f9d0cae4bf6a24172 SHA-256: a4ec9d21987764d6520ab3cc44741ed2c1fef9dc8113f1048bfc8aaefa3fddf4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9986

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://trafftec.ru/strik?utm_term=notesdemusique%2528+learning+to+read+musical+notation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464077/normal_5fb77a9a83b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5fa5521a30f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5fe8108d19512.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/nuwis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474750/normal_5fadf43088874.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/8809330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fd1531485884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_5fad2fbeecd9b.pdfIn PDF document text
    • https://tanezogifa.weebly.com/uploads/1/3/4/3/134321065/227700fda251d8.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/fakuguvil/arabic_text._jsx_after_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/takegimodazeduti.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/fnaf_2_animatronic_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/create_a_ride_2_game.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8B0 4560 bytes
SHA-256: 07a5276f6e12926aa3e096be410f263eca2156b0408183fa93864ed2541dd9bb
font_01_sfnt_off0001b88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B88F 5648 bytes
SHA-256: d3d59200456baf2f87cecaecd0c91408a39280c5ff580cec8889049bee13e1b0
font_02_sfnt_off0001cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBB6 17936 bytes
SHA-256: e7f3cc05bb53daef721b777a1d1586250e1c427f1c04870b8a1392e54e9d6e46
font_03_sfnt_off000200c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200C3 16516 bytes
SHA-256: 1cddd1c429a9103c79cf9e18736be6624c5718b2269890db252799b8dc84a1b4

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