Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26bdefb2a2d30ec…

MALICIOUS

PDF

68.8 KB Created: 2021-02-22 00:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 80e273d56c253f631fe9433fb93927d1 SHA-1: 4efadaddf754b972577b27fade2eb39747c7d60c SHA-256: c26bdefb2a2d30ec7674be678a9e47b1bcf1c165d261702df5cbdd54996f8d3a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It embeds external URIs, with one prominent URL suggesting a lure related to technical calculations. The document body, though heavily obfuscated, contains text related to 'transformer ratio' and 'wkhtmltopdf', indicating a potential social engineering pretext to drive users to malicious 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://seumenha.ru/strik?utm_term=how+to+calculate+potential+transformer+ratio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381090/normal_602b80711d3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5fe9227866b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_6014cb4422d55.pdfIn PDF document text
    • http://mavpa.fun/61866893440wknpm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369655/normal_5fcaf5a01e0b8.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/2678969.pdfIn PDF document text
    • https://wavafawiwex.weebly.com/uploads/1/3/2/8/132815000/572661.pdfIn PDF document text
    • https://juwopivevonu.weebly.com/uploads/1/3/4/6/134682880/wimiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fcbf3d6da4e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevenubonanez.rf.gd/sql_server_2012_32_bit.pdfIn PDF document text
    • http://tosaxope.rf.gd/delezavemew.pdfIn PDF document text
    • http://vofaxov.epizy.com/john_waters_carsick.pdfIn PDF document text
    • http://nixevafuzija.epizy.com/96806391150.pdfIn PDF document text
    • http://tereneduzoz.epizy.com/lagu_on_my_way_planet_lagu.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/o_que__uma_reviso_bibliogrfica.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/co_active_coaching_training_reviews.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_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 5212 bytes
SHA-256: fde61a0f30a2d805cea4e4788f8cc7eeb8e3230048a313f30a37a460b1695c80
font_01_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 11176 bytes
SHA-256: ffbbecfc176bb38cd15d61e575a0892db80b3f386c8dee2dc8889bd954cdc658

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