Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb0404b3dafbb51…

MALICIOUS

PDF

80.7 KB Created: 2021-02-21 23:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b9c24db98077237d953063ebe8d70c28 SHA-1: c3d1dd39594c29482b48674294eeddefa316c288 SHA-256: bfb0404b3dafbb51e0807c5a2b3dceba22e159dd53977e1b399cbf00bb89c738
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the primary goal is to redirect users to external sites for further exploitation.

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://jottigo.ru/wix?keyword=my+old+gameboy+apk PDF link annotation
    • https://cdn.sqhk.co/gabadifofibo/QOD6gcH/blood_money_rapper_killer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496381/normal_5ff3cfae8bc1f.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/3rHgcgf/mowunowafarikime.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/Xjgiahi/13010037124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_60281e43d955d.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/siijjtK/fesuli.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/Ijjgjgd/xidapujojesa.pdfIn PDF document text
    • https://cdn.sqhk.co/vusopukov/dgeihzo/rolling_stones_tie_dye_shirt_urban_outfitters.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/5632426.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/tuzamada/wopunesefiwufetaru.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/colored_corrugated_plastic_sheets_4x8.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/rukodaduz.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/diy_queen_size_platform_bed_plans.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 10716 bytes
SHA-256: 356d0833cd0e1b5a068462fa81e8431c331359c44b9c331296a7047e3952631d
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 5316 bytes
SHA-256: 281e7c13d9e805a08ba8fd0ef2d938bf441427f91cafd20f7e2705989a998fd3
font_02_sfnt_off00011394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 10016 bytes
SHA-256: c14878d2466da3cdc52cf0df310401b4445a138cee0405c9c3bb10018410d85b

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