Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f7b06fa855e02c…

MALICIOUS

PDF

179.1 KB Created: 2021-03-04 00:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 040a6e200c43de37d2af0781ad6b4383 SHA-1: ed4559b61f01cb23de6d0cbe91b72e4343d95a9e SHA-256: 23f7b06fa855e02c38955723396e50802deadc9aee4e5f59c612d133be25a688
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to marketing terms, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/award?keyword=what+are+the+7p%2527s+of+marketing+and+their+meaning PDF link annotation
    • http://stikc.xyz/553565675016krmf.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/mezitopotomu.pdfIn PDF document text
    • http://nufogikije.22web.org/video_er_software_for_chrome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_6035e14bdd245.pdfIn PDF document text
    • http://mini-cam2.club/jakaduwaburosu3xw4w.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/sowizuwev-vuxewowe.pdfIn PDF document text
    • http://vejefulolite.22web.org/86700532983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lomogas/dupov.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/58780116786.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/weekly_calendar_2018_template.pdfIn PDF document text
    • http://pizusikobejitix.epizy.com/87519694891.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000278f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278F9 5404 bytes
SHA-256: 67966b2cab63acee6e7b20536440e10c952880cf5f57729152b0786cda8a021e
font_01_sfnt_off00028b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B4D 11068 bytes
SHA-256: 6a38744f4a1afd3e585601d1d70dbfcb4b9eb75b5f3ede4adfb7c1da8e3be48f
font_02_sfnt_off0002b10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B10F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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