Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde8626a932e1721…

MALICIOUS

PDF

77.2 KB Created: 2021-04-08 06:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf940b82dfbc1ef8d3126ab409a37c83 SHA-1: 2055cbfeab44ff0dc3a1e2751a1ffa50089add37 SHA-256: bde8626a932e17219d7f936c7ec4b86d713ffe7274209bc0061a0b14d469c42c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the document body, which appears to be garbled but contains a search term, point towards a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=bhojpuri+song+dj+2017++mp4
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/4460464.pdf
    • http://lolebunefa.iblogger.org/anemia_en_peru.pdf
    • http://fexabudobix.getenjoyment.net/pejiji.pdf
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/6406787.pdf
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/belozetafemererazaxe.pdf
    • http://gayerkan.com/universit_scienze_della_formazione_primaria_bergamoqcgrj.pdf
    • http://randname.ru/jomikisovomumat4beo.pdf
    • https://zolagefotatol.weebly.com/uploads/1/3/4/7/134709454/8982118.pdf
    • http://kaxiwemusemoj.mypressonline.com/bawunonuwofesogax.pdf
    • http://questotzvezd.space/stihl_fs90r_carburetor_diagramb47nz.pdf
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/9617603.pdf
    • http://nigasheff.xyz/george_foreman_ggr50b_indoor_outdoor_grill_reviewtkf51.pdf
    • https://rozeravepirasaj.weebly.com/uploads/1/3/2/8/132816036/digogu.pdf
    • http://fipizilemuwob.medianewsonline.com/2020_toyota_camry_xse_red_interior_price.pdf
    • https://bosupazalo.weebly.com/uploads/1/3/4/4/134473359/1291363.pdf
    • http://mapotilij.mygamesonline.org/calendrier_juillet_2020__imprimer.pdf
    • https://sowubibuf.weebly.com/uploads/1/3/4/3/134308786/0c16092c6d3855.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sukokovevaz.atwebpages.com/old_balarama.pdf
    • http://dasipidiguw.rf.gd/beginning_yoga_poses.pdf
    • http://kiwimodilumipov.epizy.com/97385110178.pdf
    • http://duxepivol.myartsonline.com/autocad_2020_shortcut_keys_for_commands.pdf
    • http://zaxuzut.atwebpages.com/pathophysiology_copstead_free.pdf
    • http://govetijedofesol.rf.gd/46435386362.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_off0000ed4f.bin
1dfd98162e50603d3df2cc244925c4db925cb0b12da3b26a635fd28783be4319		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 5748 bytes
font_01_sfnt_off000100db.bin
c6ccc87e20097ab43d264e6261057b6e86a0edcc0aa2ebc8384c918926b19be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 11520 bytes

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