Malicious PDF — malware analysis report

Static analysis result for SHA-256 1355a38c4c9c519d…

MALICIOUS

PDF

73.9 KB Created: 2021-02-23 03:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 32c32a6a51024a5a670a705efdfc683f SHA-1: 837046cc8d9cfe73343c9b071dcf06d0decbfe17 SHA-256: 1355a38c4c9c519dd156533c8ad11b661e241ea0df979e70376132bda24e7bb4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicative of a link farm or phishing campaign. The 'Remote Support Tool Lure' heuristic strongly suggests the document's intent is to trick users into installing potentially malicious software. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://maypoin.ru/strik?utm_term=polaroid+z2300+charging PDF link annotation
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/mutafusige_gemagenudefaren_guzagaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/hibghhb/splashtop_download_streamer.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/ugcVjd8/17999192551.pdfIn PDF document text
    • https://debefapedokofip.weebly.com/uploads/1/3/4/3/134373265/jurupetojikune-rudumegakazexo-dobunuwego.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/Hv9zmid/46168432333.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/hhHjg7v/83048469377.pdfIn PDF document text
    • https://cdn.sqhk.co/falunibesedo/h2cCi6P/midway_umc_facebook.pdfIn PDF document text
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/puxolosoxebofebigine.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/Nghicja/bandpass_filter_matlab_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/aAExhbG/22354427275.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/hejelji/warship_battle_3d_world_war_ii_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zezerixuwab/S1ichih/pes_club_manager_apk_obb_offline.pdfIn PDF document text
    • https://nukarudurarera.weebly.com/uploads/1/3/1/3/131380042/boxilu.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/jjhggzc/galuro.pdfIn PDF document text
    • https://zidadosivifaju.weebly.com/uploads/1/3/0/7/130775619/mabawutakumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonebon/yandex_music_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/jerafoxexekikigevebabak.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/angular_material_calendar_date_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/kapigawawazamiwezomowilaw.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/16701818231.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 5512 bytes
SHA-256: a19f029f9fae81bcd38e8163c0315cb96bd535af62fd02ae8b332305a57f712c
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 11088 bytes
SHA-256: 09d60b06ca67f3b5500311be65f6e0495f06b999c754906c4eec454db1bcb0da

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