Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cb4b9a6a087752…

MALICIOUS

PDF

75.1 KB Created: 2021-03-25 02:23:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 186610fdba61b4bbc10f9eb5b89caf6d SHA-1: b9fa9f947a02786353208a31ce846b07770e5b00 SHA-256: 72cb4b9a6a08775269fe4fa8dfa1afe0985301bad0c9149ed30dafbacdb32862
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm the malicious nature of the file. Although no scripts were extracted, the presence of external URIs and the overall structure indicate the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=books+to+read+before+entering+law+school+philippines
    • https://cdn.sqhk.co/begokaxawip/bp0hg6I/football_trading_cards_near_me.pdf
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdf
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/48d4e856e79d896.pdf
    • http://psychologyrelax.xyz/chrome_free_for_android_phone2j09c.pdf
    • https://cdn.sqhk.co/ramekodetuwe/c6gdxhi/41235654957.pdf
    • https://static.s123-cdn-static.com/uploads/4447903/normal_5fcc689e53359.pdf
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd3dae41e41e.pdf
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5fda391eb1e21.pdf
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/vojitefuzube-raroxul-fisavi.pdf
    • http://nefritthebestthing.site/gba_emulator_free_onlineodfoc.pdf
    • http://xidijisuf.22web.org/rokavewilakuluserab.pdf
    • https://gededojoseg.weebly.com/uploads/1/3/4/3/134341448/4609714.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3b8ad4b6-51c9-46d8-a916-846cee01eb86/povukutenaramasavawudav.pdf
    • http://nazifaba.rf.gd/nutrition_for_weight_loss.pdf
    • https://uploads.strikinglycdn.com/files/854c7a21-3e57-487a-bdc7-a8f86bbad70e/83754186417.pdf
    • https://uploads.strikinglycdn.com/files/ea1f256e-e7b7-4893-8948-8e6a57a03605/satit.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_off0000e412.bin
98258a5582464cea558472bca89b78736c192f4701176fdee23589575d037dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 5760 bytes
font_01_sfnt_off0000f7bc.bin
7320790369c12f3e3bde7a417316c741bb029a43a44e437cdec3c65ab424369f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 11252 bytes

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