Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1eb8dd88f3dd5c…

MALICIOUS

PDF

72.5 KB Created: 2021-01-29 22:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5ef33ae23feba5750bcd19b00ca8ee8c SHA-1: 8183dc07d5389d4e2ad7adec434f30b09923e4e7 SHA-256: 8f1eb8dd88f3dd5c083798cafce33f240fceb17762a58b2c6a674647e59bb5c8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one disguised as a 'game speed hack apk', suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded links and the overall structure point towards a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=game%20speed%20hack%20apk%20no%20root PDF link annotation
    • http://iclod.tech/archery_tournament_perry_gam2o43.pdfIn PDF document text
    • http://retys.space/26413727398ov7ch.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/7593a4d6acf.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/zuverebufuginujotawi.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/kamesul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_6006482737a79.pdfIn PDF document text
    • http://kisiguvawatabom.22web.org/page_borders_for_certificates_free.pdfIn PDF document text
    • https://vusuvokitajize.weebly.com/uploads/1/3/0/8/130874031/54d41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459185/normal_5ffcd7a19420e.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/vawoginele/fb_messenger_old_version.pdfIn PDF document text
    • http://vijijowop.epizy.com/notalobenapupegawivu.pdfIn PDF document text
    • http://baperosuvo.rf.gd/guzepakuvijubigunixuwakom.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/sarulewurufokopowalek.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/aminoacidos_neurotransmisores.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/sidinonawejal.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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 5376 bytes
SHA-256: 539fad7d27454bf3791b3132146b8508a4d86937151b982c9dcf75c05594d469
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 10612 bytes
SHA-256: 86fe05dfabfa26a6c68a62af1303632d7c49af59e53fbc7d3e9be2f98e84c751

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