Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc6b714bdaf86ff…

MALICIOUS

PDF

69.6 KB Created: 2020-12-29 14:23:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 549858d313c706fd037b22eeafb5a47b SHA-1: 771af03e4a19e577748bc45ad14690264c35a0ab SHA-256: bbc6b714bdaf86ffe38b7a4f7b9edb4d52f65e823332d9186ee1b36b8b8c0f3d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains an embedded URL that directs users to a site related to job advertisements, suggesting a phishing lure. No scripts were extracted, but the presence of an external URI and the ML/ClamAV detections strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=advertising+job+salary+entry+level PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fc986d54e623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5fe19b1949f6b.pdfIn PDF document text
    • https://cdn.sqhk.co/wawerugile/r2ieAjb/dancing_line_2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_5fb4ac28ddf0a.pdfIn PDF document text
    • https://cdn.sqhk.co/zirimikuj/WNgdH9T/idle_arena_evolution_legends_facebook.pdfIn PDF document text
    • https://misoxuvisobi.weebly.com/uploads/1/3/4/6/134673897/d4ef5c02a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5fcb056e4118d.pdfIn PDF document text
    • https://cdn.sqhk.co/pefibovip/jhaFihF/telijupinudedim.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/QyjeamA/61593862445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470029/normal_5fb2a52b44595.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/V27S5Bm/14816859476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fd91449c8c23.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/zolerazowubow/teaching_colors_esl_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/83306989865.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_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 5360 bytes
SHA-256: 2c16331e63f57405e1605ea9a6a0ec12cc26324453b6ffbbe11c1ea9ac224a65
font_01_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 10296 bytes
SHA-256: 0b8798022b93cb83878454b671a7f9861041bbf5f28cb9bea6c1bf916ff6ed29