Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7baee29cf908d5…

MALICIOUS

PDF

73.7 KB Created: 2021-02-21 16:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4fd5deac7ea27db6f37bae57b7ca91a5 SHA-1: 622b369e575eaad62cb6d6195a936fd1b39aab4c SHA-256: 8b7baee29cf908d555ca67d62b8ada9d0a865cc914ed81c677a448c67a27cdf5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wix?keyword=words+that+start+with+the+letter+q PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404108/normal_60244b4b951ee.pdfIn PDF document text
    • http://spoonnumberone.xyz/video_nightcore_i_see_your_monsterju9d3.pdfIn PDF document text
    • https://redutoxaxijarow.weebly.com/uploads/1/3/4/7/134760413/liturinopup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_60264b0090891.pdfIn PDF document text
    • https://pujonavow.weebly.com/uploads/1/3/5/9/135958036/cc96b7d2e2d4cfb.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/7738917.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/character_of_macbethpcztz.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/jhhlLii/cartoon_network_arabic_free_games.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/vosadevi.pdfIn PDF document text
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/zozegege_lomujigibonefa.pdfIn PDF document text
    • http://gupozatu.22web.org/reported_speech_questions_worksheet.pdfIn PDF document text
    • https://rosajojuzexoked.weebly.com/uploads/1/3/0/8/130874599/nowilujakiwikebuze.pdfIn PDF document text
    • http://gloslides.com/what_battery_does_suunto_core_takexdgy8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_60180b51957c7.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/d673273dd.pdfIn PDF document text
    • http://shopmzm.site/persona_5_chanting_baboon8sgmt.pdfIn PDF document text
    • http://telemprom.xyz/73288352723bywcp.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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 5144 bytes
SHA-256: cf5361f4ab833d8778c98cbe297d3639652b46a647e4fa3fbd862bb9e9aa3e6e
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 10428 bytes
SHA-256: 30a35bccaa2396c0e34d8d320f0ae2ec6fe8a0d0702771452ff7258443327440

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