Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1164d33faedacd…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 07:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ec80f4bd6939ed405691dae933412d99 SHA-1: 013918e13d56ea66f54678fb70ed79dfe8d08d96 SHA-256: 5a1164d33faedacd45b30e1f7f40a0dc861179c6693c10d29fd1d76eaa72c948
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://directopinion.biz/uploads/FCK_files/file/15735591788.pdf In PDF document text
    • http://duancanhotot.com/upload/files/lajozotepimemi.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/rabujusizajezom.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/63614704290.pdfIn PDF document text
    • http://cpviettin.com/upload/files/50193678481.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/8831895281.pdfIn PDF document text
    • http://modero.vn/upload/files/demovizirubiparesabaxe.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/dulalijalufif.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/pebonobediditeki.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/bumebosewirebe.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/wilun.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/beranofoju.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/59387056053.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/28237808043.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355d7dc6775---kajegalibavibozirinazixi.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/99250548402.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/razivurunewojajugogedukid.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/rarulexizuveruravowego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+dance+full+moviePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 17456 bytes
SHA-256: 0d43b9a63f112a894cbe953e405a1094ffae5a99cfedb3f241b4fe77e7dc9126
font_02_sfnt_off00013fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE4 10516 bytes
SHA-256: b18a37bb064fd261b5e7067ce8cf3718616a477dfb903e868667dc6eca96ff14

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