Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a804896b12e3815…

MALICIOUS

PDF

67.6 KB Created: 2021-01-29 10:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bb71bbaaddf9fb2e48e737028595b9e8 SHA-1: ac597115973847b9f0b638dff8aa573384ffd0eb SHA-256: 8a804896b12e38151dea94f2a7e94b932ac13900d3972c4ff9ba391c6d47cb71
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 flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent.

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://maypoin.ru/123?utm_term=como+se+llama+usted PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5ff38f15e36e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fffa352cb8ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489587/normal_5fdf8c7103cd2.pdfIn PDF document text
    • https://jonenatone.weebly.com/uploads/1/3/1/8/131872225/1298514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fe93c8864de6.pdfIn PDF document text
    • http://xonibiz.22web.org/dworzec_pkp_bydgoszcz_gwna_informacja_telefon.pdfIn PDF document text
    • http://jebuzakawug.iblogger.org/16948492552.pdfIn PDF document text
    • http://roskycnmx.com/cytus_2_miku_apkjk5lp.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/lutibu-nutafedu-furorobudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezexibubaju.rf.gd/senaxibelewibuwexigefu.pdfIn PDF document text
    • http://pizoxuwa.epizy.com/65054706934.pdfIn PDF document text
    • http://buxebawimiro.epizy.com/50118301114.pdfIn PDF document text
    • http://filopatoj.rf.gd/beximupilojuneji.pdfIn PDF document text
    • http://siwojanapav.epizy.com/newoxugomoso.pdfIn PDF document text
    • http://buximonerivib.epizy.com/cabal_force_blader_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/human_anatomy_and_physiology_study_notes.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_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 4780 bytes
SHA-256: 883d071f419dc18848b0c8ecee44fbc242db13811ac0d5eb9ce7f21591a8e9f9
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 12024 bytes
SHA-256: 4d2c68ad1869d45dde2cd8d52f3c887c6c0617329d9e791c890e305a8fe3d80f

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