Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc73049fa8cc173…

MALICIOUS

PDF

71.2 KB Created: 2021-02-17 14:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 48c6f5d0f2e25b57f1ba2ac1520d449c SHA-1: baf6a3fd7015f2c5a4051a29012b4fc5a246ba13 SHA-256: 8cc73049fa8cc173da7540708347d65fca51df19ffd33e239b96680fbd0f38ea
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains metadata related to a product review and the authoring application, which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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=dell+inspiron+13+7359+review PDF link annotation
    • http://smallita.space/traditional_chinese_medicine_free_downloadb6xyq.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/bXJjgbr/70668100435.pdfIn PDF document text
    • http://dkblogin-de.best/nawipagivaxowadajawesarerb4znj.pdfIn PDF document text
    • http://firstdoctor.xyz/l_histoire_de_blanche_neigeo69cs.pdfIn PDF document text
    • http://tehnotop.site/diesel_mechanic_near_me_mobilebq6fy.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/a5tPMED/cell_evolution_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/jgjhHig/mofitevejuwizifepobaxewo.pdfIn PDF document text
    • http://job-finder.space/nixenozodet3krd7.pdfIn PDF document text
    • http://andyhong.blog/mabelm2a91.pdfIn PDF document text
    • http://vinorama.fun/migubafiboruvadavesu5l7rp.pdfIn PDF document text
    • http://disclosures.space/server_2016_routing_and_remote_accessrh2jp.pdfIn PDF document text
    • http://hisgohar.site/free_crossword_puzzles_with_answers62ai8.pdfIn PDF document text
    • http://nicechange.space/jacuzzi_j-365_parts_manual39r4u.pdfIn PDF document text
    • http://itdiscount.info/pursuit_of_holiness_study_guidemo5m5.pdfIn PDF document text
    • http://fastcreditreport.info/best_cold_sales_email_template46pdi.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/QDZhagi/animated_movie_maker_online_free_no_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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 5328 bytes
SHA-256: d9d4bc55563abf60993191e8ee549c66ca7f783e4acbfb921447075b4e80e500
font_01_sfnt_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 10440 bytes
SHA-256: c8f0d4e499a444f04b7561e32e7220f4065fae577f48e819ac8dad191b653568

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