Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5672186437270c8…

MALICIOUS

PDF

68.6 KB Created: 2021-10-02 23:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa3124a454c3560ad0f0e05c2d0ad947 SHA-1: 2a072468cee978a7ef838799cc86abbf0840f27f SHA-256: a5672186437270c8651f288a94f7fb503e615668cfc1bd800e227a79625114bc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link, a common tactic for delivering malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://brianhigbielaw.com/UserFiles/file/tewagulibexuzegezadezavi.pdf In PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/22551694590.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/88004337637.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/86849479003.pdfIn PDF document text
    • https://agatanorek.com/files/file/4341123521.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/bilefazabipegawanimanarin.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fofofuvezajiwip.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/lepijo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/aqj78emghv0ttqncht1qj4dla4/99804374114.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/71694312288.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/misusibopuxobawafivanem.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/jumufovowukipewomazenebew.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/74358197688.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/bimenuzijijeduros.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630909373.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/tusewidaxif.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/kunadiwuxum.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/31221814314.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/84693174965.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/xofesiletuletefep.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9384c9c5be1d7d04825007554df84978/bitibat.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/genenorobifakakekeridaw.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/44137055408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ieee+conference+papers+pdfPDF 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_off0000b19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19B 14348 bytes
SHA-256: 240fa2d5562f4fbeade95857ef3f8fdf5c6b5a9c24f4ba983a2e9dad4a9e064c
font_01_sfnt_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 10328 bytes
SHA-256: c0b6f01166fd31c37b41d195d9b9b4a8ccbf404ad95efc7a9736275f84f135f1
font_02_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1