Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db10689a0cb0f33…

MALICIOUS

PDF

67.3 KB Created: 2021-01-31 10:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 791d33e0fa9b0af303676dee62358e90 SHA-1: b4555093360b502d0b65c7084d01a99fdc972377 SHA-256: 6db10689a0cb0f333329ece5c6f53cd6e2de1f84a8d40423ab142eb8b4af0f50
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the PDF is part of a network of sites designed for malicious purposes.

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/123?utm_term=micro+usb+extension+cable+10m PDF link annotation
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/mafenerewakub_teligi_wifat.pdfIn PDF document text
    • http://scrlt.xyz/national_geographic_store_locations_londonp24hz.pdfIn PDF document text
    • http://instapriz365.online/90039361046fu3qz.pdfIn PDF document text
    • http://bezprovodov.guru/16773620352cfd6l.pdfIn PDF document text
    • http://lavkavkusa.store/skyrim_aesir_armor_riddle_answershi5pi.pdfIn PDF document text
    • https://cdn.sqhk.co/rukefazox/4idZjeB/fun_free_song_ringtones_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_5fda8a241a30b.pdfIn PDF document text
    • http://moviesaddaa.online/the_slight_edge_jeff_olson_italianokbc8n.pdfIn PDF document text
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/zagek_titaliti.pdfIn PDF document text
    • http://tells.fun/meepo_city_rider_2_for_sale7nw7a.pdfIn PDF document text
    • http://detonic-hypertonie.website/reflex_klystron_theoryvjue0.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/tawunevopiva.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/06a05e5e1a.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/hbjhgdP/verufizo.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/3811808.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/tgeKhje/xefasunafo.pdfIn PDF document text
    • https://cdn.sqhk.co/subogutaze/2NihAic/patitivopegusovof.pdfIn PDF document text
    • http://stavki-na-sport.site/jumajenukogexefjaux.pdfIn PDF document text
    • https://refedekejevejat.weebly.com/uploads/1/3/4/3/134312363/f88af00016b497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 5352 bytes
SHA-256: 6c5330d5985db317af21a3dc7f0065feac832077d485a1c9b1873ea826803f83
font_01_sfnt_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 10868 bytes
SHA-256: c0c1a4a461369a3afa0f8880c37e099319f3b47161a54c5f9bf79d95e7f1f08d

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