Malicious PDF — malware analysis report

Static analysis result for SHA-256 6832b412f5182559…

MALICIOUS

PDF

81.6 KB Created: 2021-03-23 04:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 712589521aea9f936011480bcbc09e4a SHA-1: 08d24bfce37407dff8be2d90beb3ce08e5b60a7f SHA-256: 6832b412f5182559dc24973cc663c2112cb22f6c45d966a452851570c6e61364
216 Risk Score

Malware Insights

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

The file was detected as a phishing lure by multiple heuristics, including brand impersonation and a large number of external links, suggesting it's part of a link farm or SEO poisoning campaign. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards exploitation and phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/waxadafatojas.pdf.
  • 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://lozipotod.ru/wix?keyword=big+ideas+math+geometry+book+pdf PDF link annotation
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/waxadafatojas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391909/normal_5fe3dd40593d9.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/jgmhihj/poni_camera_photo_editor_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/cij6FAn/dictionary_app_for_pc_offline.pdfIn PDF document text
    • https://pidoruna.weebly.com/uploads/1/3/5/9/135966994/15c370fb3d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fc5acfcb7828.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/jdiaAia/velocity_rush_parkour_action_game_hack.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/9823374.pdfIn PDF document text
    • https://kizinuraximi.weebly.com/uploads/1/3/4/4/134446503/a2ff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368488/normal_5feb0cc0d0e98.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/vufupu/swayamvaram_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/lufaja.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/sosukupukokorugemafip.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/63490958616.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_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 5780 bytes
SHA-256: 3b570ff5cee851ff3cdc204a41f32127197693faebbd507762c7b1a046ac6746
font_01_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 11936 bytes
SHA-256: fb1167a98e432f11920f16c2df278d08ad3f6f24b9a176df762f826ea0b33f88

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