Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17f2d3c4e1396cc…

MALICIOUS

PDF

77.8 KB Created: 2021-02-15 09:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7b700a9e8b65b757f4bb2507db9fe0f0 SHA-1: 141a6a6f8a86da5ff9f1a3642e18a190cf91c067 SHA-256: c17f2d3c4e1396cccf6526cc010b6e160cdeac3080e08c9a3ad6145836621d24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration. Heuristics indicate this is a phishing-related PDF, and ML classifiers strongly agree. The primary function appears to be redirecting users to potentially malicious or phishing sites, rather than executing a direct exploit within the PDF itself.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/aws?utm_term=external+audit+risk+assessment+template PDF link annotation
    • http://tepafuvofes.iblogger.org/vofuzamapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_602198135070e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459629/normal_6006684663c65.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/egcDvjg/6019400395.pdfIn PDF document text
    • https://cdn.sqhk.co/tujuvemevo/6gchFab/1623230669.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/lifijhd/within_temptation_faster_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/gjii3Ek/43396877558.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/9SNvKoe/solar_smash_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378149/normal_5ff5b5d5d7060.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/lih3igd/34128667392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zinizebaki.epizy.com/calculus_3_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/free_florida_boat_bill_of_sale_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/cow_dairy_farming_project_report_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/infographic_template_ai.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/85450370346.pdfIn PDF document text
    • http://menivafanar.epizy.com/5861538828.pdfIn PDF document text
    • http://pizubape.rf.gd/babhana_mange_chumma_dj_song.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_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 5192 bytes
SHA-256: 87787a057bad10a1cf3d79c36810063a63bd72665408b7aa043d870ce9e8707f
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 10592 bytes
SHA-256: 489461a3e42b12b21dca8d60186aafbf3c1b36c7033e87f11f1b969ed7a298ef

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