Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab7afe3a9f5c2eb…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 22:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5c2d2c6f63b2afe4ed3c9840790c091 SHA-1: e4a96a083ee929ff72f91d4370d725cf8037274a SHA-256: 0ab7afe3a9f5c2eb9e9a08ec121c6a1691411cde7bc42eb32a1d10dddc2cd7e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure the ultimate destination. The presence of external URIs and the 'link farm' heuristic strongly suggest this document is part of a phishing or malware distribution chain, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308496966065.pdf In PDF document text
    • http://a1-automotivegroup.com/upload/files/gezefekomakofabokuzon.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/93119728037.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/sedip.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/megifedan.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/rogona.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/jufedatinumafon.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631534576.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161463f4bd8ccb---gapaxubipoz.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/jiwibidox.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/77265416571.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/26243845136.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/81266229332.pdfIn PDF document text
    • http://fnathservices.com/upload/file/wenumumemizeko.pdfIn PDF document text
    • http://gardatrans.com/content/Files/zifuvotimef.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/nageton.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/nolodekog.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/51896439424.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/kadikujes.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/67009924491.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/susuvalezogeliku.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021090416143241.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/gifidasodoxila.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/jawozanuzerasolawigoxebi.pdfIn PDF document text
    • http://lovesenergy.com/file/23821926886.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/sazenuleladugabalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+cit+zombie+tsunamiPDF 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_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 10820 bytes
SHA-256: 31c76ff1d50ba39455714b6abd30e0ad192bd913864002eea05e34981c687723
font_02_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 17464 bytes
SHA-256: 421a8e6b4c5300a42c52042099869396071b5a9db6f0742928a1836b89af0bc6

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