Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4de12c8bc15ba41…

MALICIOUS

PDF

70.2 KB Created: 2021-01-13 19:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 933baf7bd6c06424219b1d3c7b74e442 SHA-1: 6c092beb86f8599f16c9bb52a0939fd061d43e47 SHA-256: f4de12c8bc15ba41ee6f277102534482185941b6efbb70acb385819fb0978ab7
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to distribute malicious content or redirect users to phishing sites. The embedded URLs, such as 'https://trafffi.ru/aws?utm_term=cs+company+law+practice+manual', are likely part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=cs+company+law+practice+manual PDF link annotation
    • https://refiraledekire.weebly.com/uploads/1/3/4/7/134715744/00af0b3.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/nikax_xofaza_xikata.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/hhdhiIW/pixel_pinball_arcade_game.pdfIn PDF document text
    • https://raragunaxunu.weebly.com/uploads/1/3/4/8/134886293/6850988.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/bAiijje/57061112039.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/aojhtAY/bo4_zombies_gun_unlock_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/hB2ihco/bounce_game_code._org.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/jeiiamM/amazon_music_unlimited_family_plan.pdfIn PDF document text
    • https://site-1175635.mozfiles.com/files/1175635/color_jump_ball_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/WXq8xGD/pce._emu_paid_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/warugariluxe/xjdggjg/telehealth_services_defined.pdfIn PDF document text
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/pexitotilak.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/jgjbjic/one_button_soccer_game.pdfIn PDF document text
    • https://mekebibarefuj.weebly.com/uploads/1/3/5/3/135335096/rafaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 5180 bytes
SHA-256: 2779b52046801d4d13dc08ae640ce7c881d98f8a1c1da78744c5186b2fbc202c
font_01_sfnt_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 10812 bytes
SHA-256: 63b5bb67eb4daf4f68cd1f912a5bf442cfcde0caf380b5e9561f833498fdd6cb

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