Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acf86ab580b0310…

MALICIOUS

PDF

84.0 KB Created: 2021-03-02 09:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8c484bc8b33356e650671c2db17dc167 SHA-1: b6c27e9bf76907a00547f02557756debf0106eaa SHA-256: 0acf86ab580b0310a5f293ec8d16275651afd11263d3818985fbac7f77f9a1c7
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan variant. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain ('midufefew.ru') that appears to be part of a link farm designed to redirect users. The document's structure and the presence of embedded links suggest an attempt to trick users into visiting malicious websites, likely for credential harvesting 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 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://midufefew.ru/aws?utm_term=how+to+replace+ge+water+filter+head PDF link annotation
    • https://cdn.sqhk.co/geruxibab/85mieQO/rufipanazezibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_60297adc70ab4.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/gjjhbbj/digi_telecommunications_head_office_number_north_carolina.pdfIn PDF document text
    • http://degimogug.mypressonline.com/vorukuwimeliweji.pdfIn PDF document text
    • https://cdn.sqhk.co/dalogunutixo/3NLia8v/snake_island_treasure_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/bgggQ1J/tubusagekabepusajoxo.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/4217304762.pdfIn PDF document text
    • https://cdn.sqhk.co/lojegalivo/aJgfRha/christmas_bingo_prizes_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/id6Vwig/texas_campground_club_jamaica_beach.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lojabupabavize.onlinewebshop.net/how_to_use_ge_digital_timer_with_astro.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/kirby_air_ride_city_trial_checklist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/how_to_save_contacts_on_android_phone.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/21861000620.pdfIn PDF document text
    • http://sudipefenivu.rf.gd/96315795161.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/1522409203.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 4972 bytes
SHA-256: db439e6cfa9d0c2217cf172667879e2990855db3eb98ff4d99c5ef459811b853
font_01_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 10148 bytes
SHA-256: 4ece70c9c70f7a5b4495d57d83f949b0d78b309511ff74cd99dbd7c519440fb9
font_02_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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