Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a728895c2a98b84…

MALICIOUS

PDF

71.7 KB Created: 2021-03-04 06:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d25c954ae450b57a79b404df27d1763e SHA-1: 78da94bd8b57cce5850911af8ea10208bae31c0c SHA-256: 6a728895c2a98b84bceaf7e97dc8aa7059c2dc8ed6a4198ccc2fe0f2adc3bd76
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with a primary focus on 'seumenha.ru', suggesting it functions as a link farm for phishing or malware distribution. The presence of 'utm_term' parameters in the URLs indicates an attempt to track user engagement, further supporting a phishing or malicious redirection scenario.

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 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://seumenha.ru/strik?utm_term=breville+electric+kettle+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389616/normal_601aa5056262a.pdfIn PDF document text
    • http://dombitarf.ru/46118952265t5duy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461234/normal_603f6924f26c4.pdfIn PDF document text
    • http://idealica-italy.site/gopro_hero_3_plus_battery_bacpachxdey.pdfIn PDF document text
    • http://lighttravel-ng.com/barbie_full_movies_in_english_diamon0w9w4.pdfIn PDF document text
    • http://playmarket-online.com/mibototoxipuxowilivasalb8f.pdfIn PDF document text
    • http://tublitalia.space/tebadewimidulelokal3b4v.pdfIn PDF document text
    • http://shopbest.online/gehl_7810_repair_manualrd26n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_5feaf7edb9f06.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/tibitexil/bombay_dyeing_single_bed_sheets_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/fotofo.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/drama_angry_mom_sub_indo_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/64924118674.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/gospel_song_jesus_you_are_the_center_of_my_life.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/someti.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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 4940 bytes
SHA-256: 8ad4c5aeb9728e60424b4c91cf736a3af65f7106a2954fcb77e170b75731ca9e
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 10304 bytes
SHA-256: b73837fc7b2115e6e3f7ef9084f2da49f321cf2dfc9096f5420d88030b680a13

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