Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b343e57c234212…

MALICIOUS

PDF

86.8 KB Created: 2021-03-17 08:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4378957954fad9f8bd971d03e47ee691 SHA-1: d065fc1fd5bb15106e74a2769f6f16d44f8a5bfa SHA-256: e5b343e57c23421289f5fabf0240cbdfcea487a9643f8d6dbc38ebf84dd1ec70
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL identified is https://dafemum.ru/strik?utm_term=python+beginner+exercises+online, which is likely used to distribute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=python+beginner+exercises+online
    • https://cdn-cms.f-static.net/uploads/4451027/normal_601530d024896.pdf
    • https://cdn.sqhk.co/lepudijazur/haicgd3/ruregatogokafozugibipetiv.pdf
    • https://cdn-cms.f-static.net/uploads/4378845/normal_60260a7cecff2.pdf
    • https://cdn-cms.f-static.net/uploads/4497110/normal_60105e681bbd4.pdf
    • https://cdn-cms.f-static.net/uploads/4409811/normal_60469866876c3.pdf
    • https://cdn-cms.f-static.net/uploads/4461232/normal_5fdae85a55c82.pdf
    • https://cdn.sqhk.co/rebamomidaw/Kaiphfc/sky_force_reloaded_all_planes_unlocked.pdf
    • https://cdn.sqhk.co/gadukupuwe/e2geihN/nezubatis.pdf
    • https://cdn-cms.f-static.net/uploads/4494138/normal_6014c0ae23069.pdf
    • https://cdn.sqhk.co/doporaba/EjhDieS/vudepakamemiborove.pdf
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5ff8c2ef2a8ab.pdf
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5ff5536b85638.pdf
    • https://cdn.sqhk.co/dikapagoloza/PhJbjgE/nasal_cannula_definition_pronunciation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_a93c793c76f5473a8c6bc62facf8f676.pdf?index=true
    • https://uploads.strikinglycdn.com/files/95d3291b-2d72-44d4-9073-f9a749c3d5a3/my_cloud_wd_4tb_setup.pdf
    • https://s3.amazonaws.com/mokixetat/asrock_z170_pro4s_lga_1151.pdf
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_2a3ce98f4aea4db485342bc5111d6a52.pdf?index=true
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_942ae73be6df4c93902b53d955111406.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cca04836-4681-407d-b9ed-d16eefa98730/brother_p-touch_d200_instructions.pdf
    • https://s3.amazonaws.com/jeromopelurab/bible_quiz_galatians.pdf
    • https://uploads.strikinglycdn.com/files/5039f379-0566-4f72-8d17-9a0a28a08fce/gikodav.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115b0.bin
7a37942e9e38597439643307dd671a0a8c32d2be14240827b2259f0b976833b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 5160 bytes
font_01_sfnt_off00012754.bin
3f3f152b3831daa9275c7906f57df25728867969697e642ca07583ae2bd38007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12754 11424 bytes

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