Malicious PDF — malware analysis report

Static analysis result for SHA-256 029d8947e0555eb6…

MALICIOUS

PDF

74.1 KB Created: 2021-06-08 23:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eb39e09b25ceba875a08e7a5467dfe8 SHA-1: 689c13ffa62c4e9dd263105d10d45148e0842b79 SHA-256: 029d8947e0555eb61618a705d01936bd1f135f3c56a089cdd6663b1937f312a4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://wastran.ru/pbw?utm_term=drastic+ds+emulator+apk+free+download+full+patched+version', indicates a lure for downloading software. The presence of embedded PDF links further supports the link farm hypothesis, likely intended to distribute malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://wastran.ru/pbw?utm_term=drastic+ds+emulator+apk+free+download+full+patched+version
    • https://tefexetu.weebly.com/uploads/1/3/4/5/134593975/2127099.pdf
    • https://leludexubivavij.weebly.com/uploads/1/3/1/8/131860378/nejegexadis-xoluwe-rifegumomuda.pdf
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/wuzimojobodedad.pdf
    • https://cdn-cms.f-static.net/uploads/4424933/normal_601bf9595f88d.pdf
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/gonala.pdf
    • https://nozudasukexip.weebly.com/uploads/1/3/4/4/134441991/jonujeximozekunu.pdf
    • https://lukexurilewudon.weebly.com/uploads/1/3/4/3/134335891/wananikipuza-xamimare-rubob-xuseda.pdf
    • https://soputepitup.weebly.com/uploads/1/3/5/9/135973261/a2aa1cafc1.pdf
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/gubibowav.pdf
    • https://kalokawagubur.weebly.com/uploads/1/3/1/3/131398574/2515686.pdf
    • https://gurelupukuji.weebly.com/uploads/1/3/0/7/130775622/teximarusexo-wukepiradipo-sopevukanuzalen-tiserezuret.pdf
    • https://jutegejedexugak.weebly.com/uploads/1/3/5/3/135384922/2897499.pdf
    • https://benofafixumiwif.weebly.com/uploads/1/3/4/4/134497886/5324500.pdf
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/8699f.pdf
    • https://cdn-cms.f-static.net/uploads/4487409/normal_6066d07240374.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/799661f4-bd33-4ab9-b109-6bb323cfdf79/30604643362.pdf
    • https://uploads.strikinglycdn.com/files/bdfc2bf7-2f8c-440e-8aa8-bfc09cbe6d50/how_to_duo_in_pubg.pdf
    • https://uploads.strikinglycdn.com/files/afcf2007-826d-43c6-a26f-ca45a826ab98/1175567726.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e288.bin
bbb0fe03a806b1d8624372db1516fb6bb35696696ad2f1174e5485968c95b063		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 5608 bytes
font_01_sfnt_off0000f593.bin
e87e347ed9b0df1cd4396c2cc2102b37d72e7d37c6059ff7c4c2811006b4f05c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 11460 bytes

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