Malicious PDF — malware analysis report

Static analysis result for SHA-256 689ba7718e5cbd52…

MALICIOUS

PDF

82.5 KB Created: 2021-06-12 12:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8de760e7e39ddd9a1e16bb20949f24ef SHA-1: 046d83ea09725cb09aadcafabf803b5f19593138 SHA-256: 689ba7718e5cbd521f8072edd695ba02b6f23831ffcea552c444a409b62d3e1e
134 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM and an embedded URL pointing to a download page for a 'gta 5 license key'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The document body, though partially corrupted, contains text related to downloading a license key, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/pbw?utm_term=download+licence+key+for+gta+5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482012/normal_5fdd2ffdbca2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5fcb9d6d49033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_60550fab18c93.pdfIn PDF document text
    • https://gimifuzakid.weebly.com/uploads/1/3/4/3/134315082/pikidera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5ffc1b511e179.pdfIn PDF document text
    • https://sovirufumidek.weebly.com/uploads/1/3/4/9/134902413/761540.pdfIn PDF document text
    • https://suwutijotelites.weebly.com/uploads/1/3/6/0/136083726/fc68ee834f76a.pdfIn PDF document text
    • https://pediralesozalos.weebly.com/uploads/1/3/4/5/134595574/bukoke_navilel_tebabevulum.pdfIn PDF document text
    • https://vipekisurular.weebly.com/uploads/1/3/1/4/131453387/340702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_60badac37ebe0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417535/normal_60b4b54963f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491687/normal_60367fb441840.pdfIn PDF document text
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/8546462.pdfIn PDF document text
    • http://tinurll.com/1aieohIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dipoziw.pbworks.com/f/myspanishlab_answers_chapter_11.pdfIn PDF document text
    • http://zikasamu.pbworks.com/f/metowegu.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/zuxuvavodutojuvi.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144560343/19518803263.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144930210/katakofadoropopoxe.pdfIn PDF document text
    • http://penezilo.pbworks.com/f/play_battle_royale_game_online.pdfIn PDF document text
    • http://fokurid.pbworks.com/f/75341015126.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 5180 bytes
SHA-256: 3b4522b359b91da87fd712848086c2eb305fff5cf592f27e37877066ce99e143
font_01_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 11228 bytes
SHA-256: 0c06ae5ad9e2de74ee6d6ccf8205be1fe739817d485d4a1ae412666cc03f1732
font_02_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 16160 bytes
SHA-256: 71fec8a3adfe41455811528c654ef740a0d97889ddd19e39e153b04b7507b7f0
font_03_sfnt_off00012e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3