Malicious PDF — malware analysis report

Static analysis result for SHA-256 157c5c53b7fdfeac…

MALICIOUS

PDF

76.9 KB Created: 2021-03-04 19:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 02b60f4ed09631b8d0a8a3970bc7dff2 SHA-1: 988f005ef062f6cd67bc033400efb807fa115504 SHA-256: 157c5c53b7fdfeacc43ee3a338e6acc39503c8f9bad2ecb4440003fcfffe49fe
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'wmf perfect pressure cooker manual', which is likely a pretext to drive users to the malicious URLs.

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://baarspo.ru/wix?keyword=wmf+perfect+pressure+cooker+manual PDF link annotation
    • https://cdn.sqhk.co/vakanaju/IsKdKhh/39443325214.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/jgfbibr/wovesojiteka.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/jLjjjBy/rivefepavinawoxufuji.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/how_much_does_a_70_inch_tv_weigh.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/9hdUhhI/jawiwepukali.pdfIn PDF document text
    • http://tolizidusinakil.22web.org/66451729287.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/how_to_put_currency_exchange_in_excel.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/tanifidazalirakamepejek.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/rdgjEhb/power_warriors_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibejodawugizex.rf.gd/mediafre_clash_royale.pdfIn PDF document text
    • http://najunanewoji.rf.gd/39609425677.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/69481707399.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/nojusopoludarajedovuzaki.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/taranis_qx7_model_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/70088705783.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/how_to_troubleshoot_performance_issues.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/xenufufexe.pdfIn PDF document text
    • http://jilutuve.rf.gd/34324080604.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/tajixerebarosisinot.pdfIn 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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 5236 bytes
SHA-256: a09ea09828c54f0f71fe0ae69676ed4b428db1ae99fd958f64958b1c52e55e1e
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10620 bytes
SHA-256: 17567575983d1b6e1e8b8b186a789876521a93a8e2460f35df3d7778848bdbd5

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