Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0b8868e3cd258b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 14:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe5824b325ba770507b4efe4eb11914f SHA-1: 36d930405f4f99f603e2bfef55a367a0c31d65a3 SHA-256: 2f0b8868e3cd258b6c50c57285441e2ff6a1d988566260a3676288293760d516
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a redirector or downloader for further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the PDF is part of a link farm on disposable hosting, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 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://smidgel.ru/uplcv?utm_term=manual+do+pulverizador+costal+jacto+20+litros PDF link annotation
    • http://ahdjcm.com/upload/files/kuralimotozow.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a2012ea5---25187528556.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/zukesaxifexuzub.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/wosizikipunuj.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/zodagixemoz.pdfIn PDF document text
    • https://asiapharma.la/files/files/ponetidugetowidu.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/53645272576.pdfIn PDF document text
    • https://network-italia.com/file/94794022778.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/32852086237.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/nilasesimejototarokijuv.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/zategitetoluk.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/47917351992.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/25224972704.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/34164590366.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/17715390548.pdfIn PDF document text
    • https://grancom.by/upload/docs/rojuxaxapojolekej.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/memademavivekeru.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/61685756619.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/42014253129.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/lamoju.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109041657317627.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/rokizet.pdfIn PDF document text
    • http://rivucota.com/upload/files/66560604992.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/97002031951.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://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_off0000c37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 17796 bytes
SHA-256: 4c2eefaed60830f111f61746fc0da7afd77edcec012026a48b5296d210595d05
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 11096 bytes
SHA-256: 49e394757e2cf1b6f859cf173d6a63858a48d574a9659b8e8adac57aa493aa07
font_02_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1