Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed93d84892f2c37…

MALICIOUS

PDF

77.0 KB Created: 2021-03-29 14:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fe79b5159307013b05e1b6a5542d3c8 SHA-1: 9b16dbe349b698612cb7f291635d02f5cf178516 SHA-256: 9ed93d84892f2c3796cf30f360e2782bec8efe417b7b82e26604650ec114b8c0
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of the primary URLs, https://midufefew.ru/strik, is likely part of a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/strik?utm_term=garmin+920xt+black+silver+band
    • https://jizesemud.weebly.com/uploads/1/3/2/7/132710762/1048728.pdf
    • https://najonetawo.weebly.com/uploads/1/3/4/5/134522785/c9a3bd2.pdf
    • https://cdn.sqhk.co/dewobube/ficwjha/bise_sukkur_date_sheet_2019.pdf
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/tugerivof.pdf
    • https://wededizopi.weebly.com/uploads/1/3/3/9/133986349/kivarawebivem-zejivunolavex.pdf
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/b1e7e2fe6.pdf
    • https://cdn.sqhk.co/lonuxonemor/giu6zwJ/jko_antiterrorism_answers.pdf
    • https://silolovafek.weebly.com/uploads/1/3/4/7/134724041/1807581.pdf
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/romapuxaxep.pdf
    • https://cdn.sqhk.co/jerivudofin/ig9ij1H/war_commander_rogue_assault_mega_unit.pdf
    • https://cdn.sqhk.co/vomifavafo/jjQhhhj/why_school_uniforms_are_bad_uk.pdf
    • https://zegilaritapedu.weebly.com/uploads/1/3/1/4/131438092/vudagi_bawenewajefozes.pdf
    • https://cdn.sqhk.co/sedazozesufu/cdSxSgd/1927844814.pdf
    • https://cdn.sqhk.co/wafavalufa/Kifhipw/33216541273.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dobesogum/ariel_platinum_steam_shower_installation.pdf
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_621afaa05dea415095ed25cdb44d0232.pdf?index=true
    • https://s3.amazonaws.com/woneketelak/8558088708.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_88964a1d76524b15bd7caa3e7ccf43bd.pdf?index=true
    • https://s3.amazonaws.com/pewibim/bukirogimozar.pdf
    • https://s3.amazonaws.com/lawakux/how_to_configure_nanostation_loco_m2_as_repeater.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_off0000ea43.bin
a012e106d0f208d800b765abfec601d60b07a597dd788782697df6bfef8cbe69
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 5880 bytes
font_01_sfnt_off0000fe2c.bin
261f7ef880f0535918f50829d93ffb84b75a1c6a57c7558581d1d5da5640185c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 11936 bytes