Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a6cfb1eaa18d78…

MALICIOUS

PDF

73.0 KB Created: 2021-02-20 00:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: df84b200796003250cfcd3b081656f9b SHA-1: 5797ce46ec11b5fd6d9fe0d11e1a437cf98ef302 SHA-256: 16a6cfb1eaa18d786c60e2ef03970b650c56ff57ec3feafc96f1e76a34f5e5a3
156 Risk Score

Malware Insights

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

This PDF document contains numerous external links, a common tactic for phishing and SEO spam. The primary URL, https://jacksth.ru/wix?keyword=clash+of+clans+offline+mod+apk+2018, suggests a lure related to game modification downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jacksth.ru/wix?keyword=clash+of+clans+offline+mod+apk+2018 PDF link annotation
    • https://cdn.sqhk.co/tosuwukiwate/Obhdgh3/44096117112.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/hfVMjhu/walking_dead_cast_season_5_episode_16.pdfIn PDF document text
    • https://cdn.sqhk.co/zijatiki/gjgfCTJ/81848022944.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/wsOidia/xapajosinedor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_6025c5869593b.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/hdYQ61W/weather_today_boston_lincolnshire.pdfIn PDF document text
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/sokilavike.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/gzocFjc/laselupifug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_6028997db9122.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375504/normal_5fcc23b15164d.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/jaif5sK/wajituvaveriwuxeleb.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/ehgibYd/minecraft_2d-_survival_craft.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/aBKmohc/kirexefisaj.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/3411508.pdfIn PDF document text
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/dilijedefu.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/0o7vsDV/6459216251.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/geIYthb/83641214862.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/gh5HvYg/microsoft_teams_background_effects.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/Righgbo/59258485218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_600954e15ed60.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/jfdjhjc/fuxexetuwibigoladati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 5788 bytes
SHA-256: e32af8db03622c853c3ee3128e8f591fa81e75fb69ac6df82817ccdbe7d8c9c6
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10356 bytes
SHA-256: 1bf526db610cf0f0d7287ffadb19eb66926bd8b646c78be395329cc67577e8ad

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