Malicious PDF — malware analysis report

Static analysis result for SHA-256 71334c68ab2dcd90…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 17:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61590cbe974ea3294f944ac9c8304840 SHA-1: 6560a5bdadd8897043cd9ef262433763e8eb8fa0 SHA-256: 71334c68ab2dcd90b67543e564940b1c81d7d5d54bf53d53ba89996bdd78fabb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a specific ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://archism.ru/uplcv?utm_term=navscore+on+firestick PDF link annotation
    • http://swvocal.com/data/se2/file/vunebepikodojowivovisodup.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/wugere.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/91545457372.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/46050088944.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/rolefajejofetaru.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/lizivolenitexasewudu.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/44234662548.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/55101776534.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/jovorij.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c11007155dcfe5738a27f5497315078b/53215065944.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/74393635020.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c64643cd7e36650ab460f07c1b0aff23/28747378591.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/bowonusodipojuverexobid.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109020520076704.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/61402950693.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/4884591188.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/37336189836.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/21214731905.pdfIn PDF document text
    • http://bdnchem.com/upload/files/wixesulusajelusiniguvol.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210908_B7F113320C5AEBB5.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_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 19104 bytes
SHA-256: de84b01d0d1bbbf681d20c5c8223aa67f33204a40014dc1d91d9699935f70083
font_01_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14077 10416 bytes
SHA-256: 3427a32d93fde8ab8988768fd1450876b1cba1e5d369b2845895fa55e733aae5

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