Malicious PDF — malware analysis report

Static analysis result for SHA-256 7055f6b30c2c9096…

MALICIOUS

PDF

76.0 KB Created: 2021-03-19 18:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a001940d9e818c5cdd094396050db7ca SHA-1: 778d3e809c2794dba0bf61f4948a38a77e24f858 SHA-256: 7055f6b30c2c9096ed6dca493be5e6d3d6d840ce26d727e79045873fca85bd31
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links is to 'vilenefex.ru/strik', suggesting a potential phishing or malicious redirection attempt. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and link farm heuristic strongly indicate a malicious intent to direct users to potentially harmful 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=symphonie+fantastique+musical+analysis
    • https://wibotutez.weebly.com/uploads/1/3/4/0/134012840/divupamuwefov.pdf
    • https://cdn.sqhk.co/tixukiko/jf7hdhb/86805721003.pdf
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdf
    • http://xeeewq.xyz/26995116136dq7m.pdf
    • http://grandov.pro/pubatapznef.pdf
    • https://cdn.sqhk.co/sitopizol/uqhdje6/free_movie_downloader_app_for_pc.pdf
    • https://cdn.sqhk.co/zuwiwejagub/jhhZ6rv/5k_to_half_marathon_in_8_weeks.pdf
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/kitegaduxenivolo.pdf
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/9795924.pdf
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/punut_gabumopefa_gelugebuloro_vepabeke.pdf
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/sejevalumemopi.pdf
    • https://pawigesi.weebly.com/uploads/1/3/5/3/135389203/lipejog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/63c30508-97da-4f83-a781-70162c26d413/are_dewalt_brushless_drills_any_good.pdf
    • https://uploads.strikinglycdn.com/files/1aac588e-36b6-4f82-a3bc-9a14ffec428f/50434035275.pdf
    • https://uploads.strikinglycdn.com/files/54451963-9984-4dd8-9226-1942e98251b5/what_is_ex_oriente_lux_meaning.pdf
    • https://uploads.strikinglycdn.com/files/63396875-01ac-4eb4-9e1b-6bf9fec711b2/toro_snow_blower_maintenance_kit.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_off0000e970.bin
c7e83af7751b49964894afd5c7e119f5d5be5fcf4ac8b4b7bd6efb50859d24bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 5492 bytes
font_01_sfnt_off0000fc0a.bin
8d4c59c0ea1b8f1d3b06e8cae465b77405bc0369039df670ed67f2806a0758ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 11028 bytes

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