Malicious PDF — malware analysis report

Static analysis result for SHA-256 930f51733da36d18…

MALICIOUS

PDF

87.8 KB Created: 2021-03-24 19:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c20607c43f740d8aea013957bad0741a SHA-1: 0a9ebd34b86f0a592b085b777160823d41647ee5 SHA-256: 930f51733da36d188718f5c4062a7303b8bc83ce57e000370750b019b4e2dd9f
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate it functions as a link farm on disposable hosting, with numerous external URIs pointing to various domains. The primary IOC is the URL https://dugedepap.ru/strik?utm_term=what+does+bug+triage+means, which is likely part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=what+does+bug+triage+means PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387929/normal_600bc59b0e924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481821/normal_60076a1408d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_600d3e598dc96.pdfIn PDF document text
    • http://familyit.info/141214018357awi1.pdfIn PDF document text
    • http://itclick.info/pusobosevugupun68wic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_602c7fd9569ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452618/normal_6039fcb27f41c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482012/normal_5fef5f8702239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5fd659f2b0216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_6034420b38525.pdfIn PDF document text
    • http://shoop-fg.ru/sir_gawain_and_the_green_knight_answihhhr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwemevi.rf.gd/2003_ford_focus_se_engine_2.0_l_4_cylinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c735ac-508d-48a1-b19e-41055358559a/yamaha_kodiak_400_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fdfb2ca-c040-4dba-bfbc-0168ff945994/linear_integrated_circuits_books_free_download.pdfIn PDF document text
    • http://bizitezejeg.epizy.com/gifobosedefimifovel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830a75a1-757f-41d3-8651-5071b236f9f9/how_to_fix_samsung_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/83302694431.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/canfitpro_pts_study_guide.pdfIn PDF document text
    • http://fejaxiwezi.epizy.com/concept_of_history_according_to_islamic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95df2201-f9a4-45d6-8f10-98c4ae360c74/najekemotozazegux.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/ajax_get_value_from_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be068dd-5c37-47f5-b41a-a4081ddc7afb/livros_de_historia_em_ingles_para_iniciantes.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_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 5360 bytes
SHA-256: 393744e48b31b6e480b18e2563df4b1dc3108f910753848890c4272c8c93d5c1
font_01_sfnt_off00012c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0C 11216 bytes
SHA-256: 08c52c3fb9876e63c5b12bf75bdda7c1c54d5945ed9b2f35a4a4ea241d0c9a2d

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