Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8afa1e3f51b9c6c…

MALICIOUS

PDF

73.0 KB Created: 2020-12-25 18:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 480b476c25da4f80d98ceb8874e3d84c SHA-1: c22f22e05d180cecd769e6f4235943350e22d2c0 SHA-256: e8afa1e3f51b9c6ccb81c8e08372e251682e78f84048d9fc888a9abb991f9e9a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://trafficel.ru/strik?utm_term=xspc+raystorm+neo+tr4+review PDF link annotation
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/susitepap_sofofaga_mirasevijusat_lemaso.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/katizolunak-zugijujibexov-merulaku-kazubowupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5f964784cd5b1.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/ijiijgi/auctionzip_calendar_mo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5fa6f14f1c611.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/vowegozedevoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5f8d103a84cf8.pdfIn PDF document text
    • https://gaxasonazeg.weebly.com/uploads/1/3/4/3/134375181/1510243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_5faa3b7f74fbe.pdfIn PDF document text
    • https://zaxonoso.weebly.com/uploads/1/3/1/3/131381259/tiwiketofumon-bikojaxazag-nuvunafetawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5fde8652253e4.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/jeRVjTa/dobasabazujaviditonefoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_5fd66ff2e5d9b.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/wovugi/67568830214.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/8168963137.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_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 5368 bytes
SHA-256: 03afff8091eeb50ef7d65d7be86b2562b749d5339158d74c74621fda94e57a8c
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 11060 bytes
SHA-256: b8370f31b564aa4064e69b5738fcf35e219b2f0868faa311a564482e8891ba97

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