Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fec34daa7c770a…

MALICIOUS

PDF

73.0 KB Created: 2021-02-24 01:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b986d46ec5452e981e6bc5bc92470720 SHA-1: e0ff41ccdcd37d1acaf4956798780b8e9c56e133 SHA-256: 71fec34daa7c770a0f4361c436a728162d4dbeedc5d109df867c6a77c795b75b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=hp+photosmart+c4580+ink+cartridge PDF link annotation
    • https://cdn.sqhk.co/dubutemaruxu/SQmijVX/57897936752.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/j3lL8ji/madobuwik.pdfIn PDF document text
    • http://in-arenas.com/tideboxis6bcax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5fe7e35da197c.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/kudazijefisi.pdfIn PDF document text
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/256849.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/OphghR8/board_games_coffee_shop_near_me.pdfIn PDF document text
    • http://kaxiwex.iblogger.org/cccam._cfg_cccam._prio_cccam._providers.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/IMghib6/jobedisitokugirox.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/ojfjcge/switch_stack_priority_9200.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/gfiizKD/seedship_high_score.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_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 6028 bytes
SHA-256: 91e2a060b0a19f6894c1a8cfe8ba6a5dc1c8753ab7f70bccec5fed00b621f550
font_01_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 10296 bytes
SHA-256: 32573020e057ba8387d03b5be65a2110e4f7ea8f866a03ab28c08045eddda092