Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3e054894e3b6dd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 21:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36dc931526349e51c0da2efe7190d30f SHA-1: 6f94b45a1d1c0eac105360adaef6ae5de594f40c SHA-256: 9f3e054894e3b6dd2bdc76c4dc3a7ceaf3ce9e2136975556b78c7d2bfdf85ab1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated high maliciousness. It contains numerous embedded URLs, many pointing to potentially disposable domains, characteristic of a link farm. The presence of a 'download' button heuristic further suggests a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gasthaus-steinkirchen.de/img/editor/file/gekefuleluguk.pdf In PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/wanaregodevurakaga.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/45829095352.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/perozowurixupipir.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/81204188216.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/15457434219.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/fagutoturiterelinekupapo.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/59155042035.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/dupobetox.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/14434750500.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/88001939700.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/nifutaxutasirewulopibim.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/lodaromajarubiwaguz.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/862bf2c0e14dcd0c4904a29c3ef03640/83518902898.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/rizuluwotozutidoz.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/92458969915.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/pufuropopusomanegoxawu.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/5486724237.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/kabosevomovetagoje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354bca4835b---liripaxu.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/593705336614af34c95103.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/65545972609.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/78530638577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=avatar+2+movie+online+free+watch+full+movie+in+englishPDF 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_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 11136 bytes
SHA-256: 25c205099e748dd6cba35d43e5fe52d2b2185fc2b28b20d45c9f6c4739e8a4b2
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 17868 bytes
SHA-256: 271aef31f649cb10d2690026af22b8ee66df258c6f3998b7bf3511366e65ea94
font_02_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1