Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2fd43aeee89588…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 00:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: af87018d0c3d3bd912102a8d0def20a4 SHA-1: 4f3a8e7ef56284f441c5af88fb402b156b59f73a SHA-256: ce2fd43aeee8958822ca939e62c89f178e99115a1203ad5441d657c6f1386f46
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 detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure of external links.

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://xajibur.ru/123?utm_term=slicing+pie+spreadsheet PDF link annotation
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/acc4c525e.pdfIn PDF document text
    • https://bebekibuxa.weebly.com/uploads/1/3/5/9/135993907/vafewurodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5fd9d216d9d83.pdfIn PDF document text
    • http://frankiearvelo.com/4970833929880cwz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_60198c5a06579.pdfIn PDF document text
    • https://cdn.sqhk.co/baxikomo/Wjhgdf6/52780749250.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/dXqkygc/6670504226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5ff5e0b4d40a8.pdfIn PDF document text
    • http://instapriz.site/traffic_rider_apk_download_old_version4iwgq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fe58c0b6e4f7.pdfIn PDF document text
    • http://womenalikumat.22web.org/43332387995.pdfIn PDF document text
    • http://liketsven.xyz/bitlocker_for_windows_10_home_editionjezw5.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/kotuwonege-meletujubumu-gikubaxitek-juduko.pdfIn PDF document text
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/niwabop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/86531294316.pdfIn PDF document text
    • http://votofeki.epizy.com/xofakekezexiv.pdfIn PDF document text
    • http://setiwifuv.rf.gd/benazibu.pdfIn PDF document text
    • http://segoxegigo.epizy.com/http_www_adobe_com_flashplayer.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_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 5436 bytes
SHA-256: 3720979534ec36509c4f3dc0b310138f8769168a490f33c1d0e4e7c62a478264
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 10952 bytes
SHA-256: 8c61a9caa22301113a2ad90b34e7d89adcece880e645dd6de594d53cad928caa

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