Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb98c3cf3f4461c…

MALICIOUS

PDF

101.5 KB Created: 2021-06-01 09:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 27223792ed4fb7409ef067a89f1e691c SHA-1: 33fe09c56af455c98d51319d177c1a0c3b535474 SHA-256: 3cb98c3cf3f4461c4694ba8bc92b057d17fa902e1de9e9df60fbbd8de1a9b17b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings indicate that the document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://catamma.ru/pbw?utm_term=descargar+juegos+para+emulador+ppsspp+para+pc+gratis PDF link annotation
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/7269e8c125.pdfIn PDF document text
    • https://pizupunaj.weebly.com/uploads/1/3/1/4/131406403/kemosulotakul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_5fd619c60b322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458631/normal_6001488dbdbe1.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/nawedajajuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_604a57f39184c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_603299cc660ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fe65edaecff7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408319/normal_5fe48afb366ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144432477/michael_buble_songs_it_had_to_be_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d964822f-b231-4347-9b31-d4dd163205b8/11738141186.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/w/file/fetch/144444060/strongest_dinosaur_in_ark_2020.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144427377/navupefabi.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/33602029537.pdfIn PDF document text
    • http://sorawako.pbworks.com/f/porup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4a36ea-cd50-4cd3-8ae0-2d270f619e62/how_to_diagnose_ptsd_test.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/w/file/fetch/144450060/19313702848.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001438c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438C 5468 bytes
SHA-256: 9ca768ec5d119d5736f1908732d9f3b21902c9314349d354039f1664e818ce68
font_01_sfnt_off00015612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15612 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00015ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA0 12256 bytes
SHA-256: 41260c53400456a7336e51ba576dc6ace0887274b2b745ab34053f9843e999ad

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