Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f5a03575299a53…

MALICIOUS

PDF

75.4 KB Created: 2021-03-12 07:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f0ac2b3321af4ec2c4f498ea7c4e6b SHA-1: 9ab51242e3a183a2db2a791b1bd89dc0271dbbed SHA-256: b8f5a03575299a53e7b4a1b7558284e1698b50ae543e9acf7f9c6d9886f466d8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'midufefew.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted from this sample, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=os+axiomas+de+zurique
    • https://static.s123-cdn-static.com/uploads/4481527/normal_5fdf9be0c5ed6.pdf
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/ranoberarovijimeluv.pdf
    • http://xumobuzum.22web.org/samsung_un40eh5300f_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4450719/normal_600e47a829044.pdf
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/joropufasom_fetezoganitat_fokopejifikeji.pdf
    • https://static.s123-cdn-static.com/uploads/4426280/normal_5fef4d3d561c6.pdf
    • https://cdn.sqhk.co/jasurisunav/846jagg/84304261928.pdf
    • https://xoburorabusu.weebly.com/uploads/1/3/0/7/130738623/japifokefivomode.pdf
    • https://cdn.sqhk.co/fekoguwiwu/8RgHahe/tuzusunobitefipe.pdf
    • http://wisopenudaris.22web.org/91802261985.pdf
    • https://static.s123-cdn-static.com/uploads/4500692/normal_5fe03abc75405.pdf
    • https://cdn.sqhk.co/pesamelez/QcBsNij/tuzesub.pdf
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/9434094.pdf
    • https://cdn-cms.f-static.net/uploads/4388619/normal_601ece5084ea3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jagesaba.epizy.com/python_mandrill_template.pdf
    • https://s3.amazonaws.com/tuxexi/84212036929.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/62482515196.pdf
    • https://s3.amazonaws.com/kefodek/addition_subtraction_of_fractions.pdf
    • http://wanedinak.epizy.com/edexcel_gcse_physics_book_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ea.bin
132a2a166c611574763f7b9f4d886130093acf76055aa278876fc5733cd19ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 5212 bytes
font_01_sfnt_off0000f794.bin
bd6051df4b3a3a737aae3dd00e7dea29234d4ca348ba8d4134881de0c0a774f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 13128 bytes

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