Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8afe7048eaa2342…

MALICIOUS

PDF

71.6 KB Created: 2021-06-12 23:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: effdf0009e3ed6a50fb8ed4ac4b4918d SHA-1: 6ca243c816ecd27e28b6c2f083eea84ef4592f90 SHA-256: b8afe7048eaa2342e1d30887a321e86a3cb6d6d1310b1489b1d1284e939613db
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains an embedded URL pointing to 'smidgel.ru', which is flagged as a disposable hosting link farm. The document body, though heavily obfuscated, suggests a lure related to 'basic addition and subtraction word problems', likely a pretext to direct the user to the malicious URL. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate 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://smidgel.ru/pbw?utm_term=basic+addition+and+subtraction+word+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446390/normal_60382e59a22e7.pdfIn PDF document text
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/6005850.pdfIn PDF document text
    • https://sulesebu.weebly.com/uploads/1/3/4/6/134634805/2596271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_605e15ee83dd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5ff928ff8716b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debitagemi.pbworks.com/f/70856598385.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/f/google.pdfIn PDF document text
    • http://tevidaxen.pbworks.com/f/nafotogup.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/w/file/fetch/144529341/81646133242.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/w/file/fetch/144552582/30532272013.pdfIn PDF document text
    • http://vogituvu.pbworks.com/f/82931380911.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/88760676724.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144650820/corel_draw_x5_free_download_full_version_with_crack_bittorrent.pdfIn PDF document text
    • http://metudebebi.pbworks.com/w/file/fetch/144872328/jogasawonafivaremesames.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144540048/billiard_ball_model_explanation.pdfIn PDF document text
    • http://tazusun.pbworks.com/w/file/fetch/145151214/mupasirokirovajiviwivaji.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/49266767518.pdfIn PDF document text
    • http://kejuziz.pbworks.com/f/95490569847.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144450477/ejercicios_resueltos_matrices_2o_bachillerato_ciencias_sociales.pdfIn PDF document text
    • http://zorapede.pbworks.com/w/file/fetch/144795717/lexomubuguzuwubex.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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 5500 bytes
SHA-256: 0310671d8025bbf4dbcd22c2e7a4fd909f46e82cbb10ab8b6887432f76f6c9d9
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 10364 bytes
SHA-256: b41a0618b5363d0134341facd150d006d0714f1ad87198b72aa2702b053d25d9

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