Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7dfdb20bbb8beb…

MALICIOUS

PDF

71.9 KB Created: 2021-01-24 21:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 36ac9b14d98679e9f54443e8c52a8048 SHA-1: eb0531a2058da1d1489e8ba08ef3d37f3faa9d67 SHA-256: 8f7dfdb20bbb8bebaf2554bce87e05dc41aad05b411bdd76f3e23a58b9502faa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm designed to attract traffic. One of the primary links, 'https://trafffe.ru/123?utm_term=android+6.0+launcher+apk+download', indicates a lure related to downloading Android applications. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://trafffe.ru/123?utm_term=android+6.0+launcher+apk+download PDF link annotation
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/fokojefopukageronumo.pdfIn PDF document text
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/4746302.pdfIn PDF document text
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/puwida.pdfIn PDF document text
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/zemufajelujo.pdfIn PDF document text
    • http://helpforteam.com/walmart_inventory_checker_ps58g0lr.pdfIn PDF document text
    • http://rejuxipo.iblogger.org/21726322848.pdfIn PDF document text
    • https://tizusetupo.weebly.com/uploads/1/3/1/6/131607013/01faa210e79b163.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/kakekojezutok/latest_general_knowledge_objective_type_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/balaji_images_hd.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/19883053581.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/lalowotiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/basic_acting_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/espn_injury_report_lakers.pdfIn PDF document text
    • http://gebuzabode.epizy.com/guy_staring_at_other_girl_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/palunurivimif.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/92400967207.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/car_sports_hd_images_free.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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 5456 bytes
SHA-256: 8b53eae046a16d69bd7c39af758311b13a1edf64c5866c04bc9021ee172b49f0
font_01_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 10700 bytes
SHA-256: efe608082ff52fd3660ceaf55e15dbd070c4c6d08c8bed98b332d4a8ea12d76a

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