Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67a13068f140286…

MALICIOUS

PDF

74.1 KB Created: 2021-09-27 02:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 346cfb8b10671be3e40736a6e4544346 SHA-1: 7f60736551a89b406bd3cf4769a77457fcab055a SHA-256: f67a13068f1402865524ee79d3a067181d55050f059790224dcaf6e1278d9699
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm designed to distribute malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drafthe.ru/uplcv?utm_term=sms+not+sending+on+android PDF link annotation
    • http://opgzvh.hr/upload/file/gixekajorepa.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/fonefuroxa.pdfIn PDF document text
    • http://sireny.net/share/files/21729037180.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/bupezukumizegitevi.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/72041626032.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/29462324524.pdfIn PDF document text
    • http://delve-cr.com/uploads/femaramalil.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/jamaxem.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/92608963739.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/rasez.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133df512fd2e---gugomimivelul.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/sebikatoli.pdfIn PDF document text
    • https://12waktu.com/contents/files/33559993411.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/49291496886.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/44841714445.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/82520443766.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/46547491774808d0e534b4acab94a3aa/tisekenafowukunela.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210919020223.pdfIn PDF document text
    • http://esen.life/userfiles/file/wirozusaxokekez.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39305549028.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/85658330665.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_off0000ba22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA22 10620 bytes
SHA-256: 3e20111cd0e2b1b366bf6cfdf81edaa811a308ea73014ac9c379f868f4593f11
font_01_sfnt_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 19192 bytes
SHA-256: 0ca667688b6651163649176de90a7eb653d717eeeca75d07c21ae94cf152980e
font_02_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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