Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc74e28373b4aa6e…

MALICIOUS

PDF

71.6 KB Created: 2021-02-22 13:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 57a91befc669dc94073a25ca858af675 SHA-1: 40f407cb185e11915fd0f13a7b2267afc6de03ea SHA-256: cc74e28373b4aa6e0c8d5e16ba1030f3f93b88427c2992626e144001b519448a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF document contains numerous external links, with a critical heuristic identifying a link farm designed to distribute other PDF files. The primary lure appears to be 'Place value to 1000 worksheets free', aiming to trick users into visiting malicious URLs. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=place+value+to+1000+worksheets+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4497078/normal_6007418295f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_5fe797728a863.pdfIn PDF document text
    • http://logunej.iblogger.org/37090252177.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/d5c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_5fe66e7e24794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_602d525b6fdad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojurixerura.epizy.com/vozukezavu.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/mizasomoxokiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/bukamawura.pdfIn PDF document text
    • http://sovizaz.epizy.com/ganefid.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/falsifying_police_report_claim.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/cambridge_audio_minx_x201_subwoofer_manual.pdfIn PDF document text
    • http://rugunazivesix.rf.gd/nufabexikim.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/mathrubhumi_calendar_2018_june.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/fox_movies_premiere_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/mavegis.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/vutidesagiwefimipibafofij.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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 5380 bytes
SHA-256: d6ecc15917ebce5f73ec30c4c0401686b340d5880e76f8495129a6859d1b7309
font_01_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 10172 bytes
SHA-256: 2c12bc7db63f2e0f1915733ee0d562175cd21eec324f0490b782a32f8e000d6f

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