Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdadc1bd9893a47…

MALICIOUS

PDF

95.2 KB Created: 2020-12-19 19:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34e67cd59c1c66ec18af9e278854d8f3 SHA-1: 516ca76dcc159141264c0c692c5847a98b8085bc SHA-256: 2cdadc1bd9893a470ebeb4d15b5e17095f184ca433def2b6e6ce0b99e23440ce
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/strik?utm_term=foo+fighters+monkey+wrench+live
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5fbd4145bd85f.pdf
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5fa7c6a466c56.pdf
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/demokonulabezuv-nuxebapef-vinerafusovo.pdf
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/2575551.pdf
    • https://denibemexe.weebly.com/uploads/1/3/4/5/134597338/430d590fe.pdf
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/b4fc87e313b0e.pdf
    • https://pewovorawegoxuv.weebly.com/uploads/1/3/4/3/134351704/zusezabevekukiw_jepafiku_puduzawofuxiw_wajogotubo.pdf
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fa14e178fef5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/16aed37f-970c-42ea-9878-e1f47ff902b8/55810177532.pdf
    • https://uploads.strikinglycdn.com/files/d6de1448-3d78-4f23-99bd-7d779da50ffd/physical_science_textbook_9th_grade_mcgraw-hill.pdf
    • https://uploads.strikinglycdn.com/files/e41e5ab4-c513-4a23-9894-a8373dac95b0/3401881773.pdf
    • https://static1.squarespace.com/static/5fc4deb088c99b6d37c0af76/t/5fcb7ed26fd93023bc05efcb/1607171794443/stickman_battle_fight_superhero_stick_fighting_game.pdf
    • https://static1.squarespace.com/static/5fdc826ac3cfda2dcf0aa550/t/5fdc97ad38e73f2e3d789223/1608292270558/management_trainee_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/wefemabeni/93796699374.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ad6.bin
135cefff6dca23678911fb540757550aa7f2dd07b6ee7cd504cb0193663c069c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 2992 bytes
font_01_sfnt_off0001357f.bin
de2aabd1343b6b3b7e716a749ac89724646282febe9ff11d6da9686527364d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 5360 bytes
font_02_sfnt_off000147be.bin
1393dd166cee485c25fba034873628ecdc797cc574c7c458e2b1ac0d910f1565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147BE 12148 bytes

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