Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b96689db930f06…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 00:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d404f62fa848edf5e1803a24896bf529 SHA-1: 24b887cb3083255676ef3b1877e28d591ebf0350 SHA-256: 80b96689db930f06f6addaae28fea84e472a27724553b37ac457347b9ad70d92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting, with one notable URI being https://pistant.ru/uplcv. The presence of embedded JavaScript, though not fully detailed, suggests potential for malicious scripting to execute or redirect users. The document body is heavily obfuscated and appears to contain metadata from wkhtmltopdf, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=manual+transmission+whine+noise PDF link annotation
    • http://shippingengineering.com/files/ckeditorothers/77677459185.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/49493091534.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/kibasoruv.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/74616755496.pdfIn PDF document text
    • http://www.polni.si/Images/files/tesaluf.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/42739604875.pdfIn PDF document text
    • https://raghuvirtrading.com/userfiles/file/67109898700.pdfIn PDF document text
    • https://fototipia.hu/files/files/21227608389.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/zixubekamexogowavosivev.pdfIn PDF document text
    • http://brlairport.com/images/file/pijibufopil.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/duzofenuror.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/74897205109.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/614f607896080.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/saluvopinafefamud.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/64101559271.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dff0df0502---59735171300.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/27753494080.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/paredurukemimixi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7678e2293784dffff461ebe316128b33/60575012065.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/fetobekanemisulerumiba.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/zilugevaparalawab.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_off0000ae82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE82 10552 bytes
SHA-256: 61bc66af6bce0accd28912ed5b9cae0f6a9025d4c08bee6ba13a668e1bb64380
font_01_sfnt_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 16576 bytes
SHA-256: 38cb4f209de096d877b5a5a4b1b6c5bc711e954636bc41d17784fbb23bd8003f
font_02_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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