Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6f5aea4a7c782d…

MALICIOUS

PDF

67.2 KB Created: 2020-11-17 01:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ca31b974458042b13669abf749a5a1 SHA-1: 792630639888705a9bce5388927919819eb50e6a SHA-256: 0c6f5aea4a7c782d924eab4faa0e87fae4cc58a317c08c80eaf39e3f93b4e789
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Vevocart coupon code' and 'wkhtmltopdf', hinting at a lure for users seeking discounts or information, leading them to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=vevocart+coupon+code
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/1fd425bf5.pdf
    • https://nopiroradonumiw.weebly.com/uploads/1/3/4/4/134401961/rudasaf.pdf
    • https://belaputeze.weebly.com/uploads/1/3/4/5/134515271/f8ab2d3f6b.pdf
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/79cc1910df.pdf
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/fuxiwalagozifun.pdf
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/giloruxidaki.pdf
    • https://dejigusadimegog.weebly.com/uploads/1/3/4/3/134324817/gozupagidivelubuvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/af565256-ba70-4d60-8ebb-3a4d49ad2299/visual_boy_advance_how_to_fix_white_screen.pdf
    • https://uploads.strikinglycdn.com/files/7787e7b0-aab7-45bc-b113-91204c3d536f/wuvoliza.pdf
    • https://s3.amazonaws.com/zuwimadaneb/high_pressure_hose_nozzle_walmart.pdf
    • https://uploads.strikinglycdn.com/files/3e9cd61a-efc9-4706-bf15-bffe98c2640e/40175602284.pdf
    • https://uploads.strikinglycdn.com/files/465c7329-b278-441c-a713-85e182677dac/saravixadizaw.pdf
    • https://uploads.strikinglycdn.com/files/6defc109-8f16-471d-a691-f5723f0a08c2/estructura_de_lewis_nh4.pdf
    • https://s3.amazonaws.com/wilugugo/social_boundaries_worksheet.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_off0000bc3a.bin
55db7370628238c73c52fabcdc5d12371d30409f3d5ea53546547431003a123f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3A 4716 bytes
font_01_sfnt_off0000cc48.bin
af80f4e255465e72bae604996f09db6b53a8d6b68558098dcbbcd69d237c6e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 11092 bytes
font_02_sfnt_off0000f227.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 4324 bytes

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