Malicious PDF — malware analysis report

Static analysis result for SHA-256 8179091d16a770c8…

MALICIOUS

PDF

145.5 KB Created: 2021-02-22 00:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 82e5875f07535d783fc74853c8504244 SHA-1: 61689a9acbcf70d5e795e9a9a7022e93b8faaa23 SHA-256: 8179091d16a770c845b5e2176cb390e9f7f30df05f12938e62bb8046e4a533fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://leonvi.ru/strik?utm_term=what+are+the+best+business+ideas+in+philippines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377674/normal_6022d2f2161e7.pdfIn PDF document text
    • http://instacopyrightcenter.com/open_appendectomy_videocbbfs.pdfIn PDF document text
    • http://realnoe-obshenie.online/62169950977a9231.pdfIn PDF document text
    • http://kzrovk.xyz/free_botnet_booter3js9t.pdfIn PDF document text
    • https://cdn.sqhk.co/kopupelek/zgdzA02/68303425303.pdfIn PDF document text
    • http://myfirstsite.xyz/lekezozorolumidugekexamip758dg.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/ibFkGia/7117649277.pdfIn PDF document text
    • http://gakmancreatures.ru/kirovuzixawut7bsdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464735/normal_5fc6ae241eec2.pdfIn PDF document text
    • https://cdn.sqhk.co/fewisezux/kihgeDL/maguselab.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/hdIUtvN/29722311014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_600a515655e52.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/geAY5je/crossword_heaven_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/iJzhgie/crazy_racing_for_pc_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/thdsgdg/vadone.pdfIn PDF document text
    • https://cdn.sqhk.co/gugosobor/HPjiSgh/final_fantasy_brave_exvius_neo_vision_aerith.pdfIn PDF document text
    • http://tk-time.site/informagiovani_macerata_lavoro54f82.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/jigcheB/do_not_touch_sign_free_download.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_off000201ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201FF 5200 bytes
SHA-256: 54e8db51aba6d830d620ad43cd71b0bdf25d19fb37d8b7ebe8c22c530a990103
font_01_sfnt_off000213a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213A7 10944 bytes
SHA-256: b4fc1274c41cba92bcce84716c62b03734be76f80bda1a9d47787c125b159ac4

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