Malicious PDF — malware analysis report

Static analysis result for SHA-256 3324105fcb834977…

MALICIOUS

PDF

86.7 KB Created: 2021-03-16 17:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe9f5571f732b712f1f3f090135d0f1d SHA-1: 9423bcc2ee3b4c67aec92d3f63390da17f46b5ff SHA-256: 3324105fcb8349771169685ae7125988ae0ad540363c5a94e626c9657292e4f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with link farms or potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's designed for phishing or malware distribution. The embedded URLs and the document body, despite being heavily obfuscated, suggest a lure related to games, likely to entice users to click through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://xezojetit.ru/wix?keyword=unblocked+games+77+papa%2527s+bakeria
    • http://shimano-stradic.ru/735234370382hiht.pdf
    • https://nuzupodulekego.weebly.com/uploads/1/3/4/6/134615520/2b830.pdf
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/2694175.pdf
    • https://wegabikiwapalev.weebly.com/uploads/1/3/5/9/135992979/3056902.pdf
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/vipejipasa.pdf
    • https://duwujesipegon.weebly.com/uploads/1/3/4/8/134883919/5191341.pdf
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/a33a4e2bc4ab20.pdf
    • http://apsmall.space/9068689634m2yfv.pdf
    • https://jaluxuza.weebly.com/uploads/1/3/4/3/134345387/3496839.pdf
    • https://wegogutez.weebly.com/uploads/1/3/4/3/134310606/aad4a3709450.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_c01cb856b45546f0addc2ebc282bbc18.pdf?index=true
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_9ff3f1ba7e5642d985e303772e366b4f.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_3baf1546f06c43e5af14f5c0022ce76c.pdf?index=true
    • http://boxokur.epizy.com/99734831054.pdf
    • http://besasasef.rf.gd/colouring_sheets_dogs_and_cats.pdf
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_f8fb20648494473ba79881a08d8aa525.pdf?index=true
    • http://zudakilaf.rf.gd/complete_list_of_antonyms_and_synonyms.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_26506a650bc545838c972bd0d5850785.pdf?index=true
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_243aacd7f6c0444096967ab52f2ec112.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c0.bin
41f705d24f7fd1293e775d9471e52053d6b063eb0c3a3270c11357108e8d7b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 5412 bytes
font_01_sfnt_off00011707.bin
140b6673b7b1532871e4be10abdf690f6b61501762437ad9c0d9804f364d6fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 12016 bytes
font_02_sfnt_off00013f84.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F84 4324 bytes

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