Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a6338e3057b416…

MALICIOUS

PDF

83.6 KB Created: 2021-05-06 07:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 219832bd89350b6edc140eb25dceca19 SHA-1: 1f24ba67e0852c8212a4b682ccc9d3485a42c27d SHA-256: 15a6338e3057b416c52c8acfc48be34cce83e9953279facdef857d44714c7eab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://xajibur.ru/strik?utm_term=yamaha+mgp32x+mixer+32-channel+manual PDF link annotation
    • https://cdn.sqhk.co/kubepugemaki/Fhcc7bw/vumej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fd39a76ac08e.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/bjggfm4/17060669640.pdfIn PDF document text
    • http://faceit.su/sigma_1009_sts_instruction_manualgnn2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_6063e36f5eefb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_605d353cdaa42.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/lebesilodixodawelunarasiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60516fdc915e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_6062904eca066.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/eHkvjji/38144586252.pdfIn PDF document text
    • http://forecast.bet/verazokimipixibi64y23.pdfIn PDF document text
    • http://ruwulepukapuk.iblogger.org/dirorokevorakuzugovotazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwogufipuja.epizy.com/rigizanotimuxop.pdfIn PDF document text
    • http://dixorinatedav.rf.gd/sufijafuzepi.pdfIn PDF document text
    • http://mawugosujutesag.epizy.com/66034487928.pdfIn PDF document text
    • http://susijul.rf.gd/memol.pdfIn PDF document text
    • http://soxenaroguz.rf.gd/norton_anthology_of_american_literature_9th_edition_volume_c.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/vonewulebem.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/metformina_presentaciones_en_mexico.pdfIn PDF document text
    • http://kolixuvurivol.epizy.com/how_much_to_charge_for_proofreading_translation.pdfIn PDF document text
    • http://jevopuvejamiv.epizy.com/lexew.pdfIn PDF document text
    • http://birotizedu.epizy.com/space_wallpaper_4k_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/kovuditepadofuxududoxaga.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_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 5528 bytes
SHA-256: 981bfdd3cf764c68c4f3ddafd21993e4054270dc6d052ba4813c25b188bab191
font_01_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 11188 bytes
SHA-256: 7787824b42438284c5849a5f351b9da1d08c61a14def2cf0b342fbd86ee9a43d

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