Malicious PDF — malware analysis report

Static analysis result for SHA-256 d701309aaae8d106…

MALICIOUS

PDF

81.7 KB Created: 2021-03-19 18:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9fd8724b08ee020fb385dfcd1b6aaea8 SHA-1: d208f48b19e92e65b7027e30d3d1bfaa7e9bbe0e SHA-256: d701309aaae8d10695b4e871de922cc056ed86c09798ac2e21780af840fcfc26
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=saltwater+fish+feeding+guide PDF link annotation
    • https://cdn.sqhk.co/xonipavu/idjeEif/breakout_classic_brick_breaker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5feb97ef9ff32.pdfIn PDF document text
    • http://ag-management.space/11859095435mh9ei.pdfIn PDF document text
    • http://ouily.xyz/12236858780u4r1w.pdfIn PDF document text
    • http://tehnikator.ru/how_does_gamestop_trading_workq17hh.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/0Dp0iaY/gravity_falls_journal_3_codes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383807/normal_5fe39e4d35273.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/ipbKgdV/duwuba.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/GSo7hh8/30629821024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470524/normal_5ffd835f516c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450039/normal_5fcc9a5205849.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ijia31V/67630245514.pdfIn PDF document text
    • http://becloud.website/how_to_change_default_user_in_kali_linuxjlzrj.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/gggNje3/tai_my_talking_hank_hack_appvn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_e14a96c8c6a74d7a97085ab24f10759b.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_d7365f8ca0d94f81bf8a11161b5678bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1740a4-219a-436f-9628-1fb168bfc0c0/learn_english_with_tv_friends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71b5bd5-9872-40d7-9170-772deef6b1f1/better_than_ever_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39eaccb-d745-41cd-b381-52a115d4a0ff/pawefogonavuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c77c6c9-670a-45c9-b723-c0e8b087153e/46078599093.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_87585175132540b68da17206772ef061.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_7d6918a895e6415c935a3267b3496c4c.pdf?index=trueIn 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_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 5364 bytes
SHA-256: 1537e9ad53987b56ff464cc952465ccedf43eec256a3d67008865ea1f53e9652
font_01_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 10976 bytes
SHA-256: c1fa4fa01a8bc46b006bc65ebbed24f769558fa4a7a5eff1c641c6d309718ccf