Malicious PDF — malware analysis report

Static analysis result for SHA-256 304aaaaeb4183777…

MALICIOUS

PDF

75.6 KB Created: 2021-02-27 08:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 80473b3445fbd955d43590a7c4e6a567 SHA-1: 19c42023e1feae9d524c26aa3b2c19a268f9859f SHA-256: 304aaaaeb418377771d7cd73a3b4c62e850b1c14228e25c634db924385afff29
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/strik?utm_term=how+do+i+connect+my+mini+jambox+to+my+computer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493282/normal_6023dd4bacede.pdfIn PDF document text
    • http://abanca-electronica.com/nopewuridezoleralofufaxcmzya.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5fc8378275f90.pdfIn PDF document text
    • http://hackins.site/how_to_remove_battery_from_apc_surge_protector2kkev.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/sigusukusewabalukodew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5fe5e93daae3b.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/tekufesixud.pdfIn PDF document text
    • https://legunumazonum.weebly.com/uploads/1/3/4/4/134455594/novavuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/dDsjdhj/88815521574.pdfIn PDF document text
    • https://cdn.sqhk.co/ninafoso/ghbJiij/war_robots_hack_game_download.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/hamlet_book_age_rating.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fde8994d190a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fc96d97e6b6f.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/radio_shack_pro_95_scanner_manual.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/how_to_replace_belt_on_hoover_elite_rewind_vacuum.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/gjeihhf/commander_s_intent_example_usmc.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5448 bytes
SHA-256: c36fb43710e26425787c8175deaa0c3133535f4a49e9e02f038d58748fb3cf9b
font_01_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 11100 bytes
SHA-256: fe905ee4d3c5087ceb19aae82f4d3bee6d634a6ae26137cd061ccecd3e844643

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