Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec93e6e53a9a015c…

MALICIOUS

PDF

88.0 KB Created: 2021-02-28 10:10:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f188dce41a0a19b13303ec956feba5ed SHA-1: e3f89a018ecbe15a5a716a50bdafe6de40883267 SHA-256: ec93e6e53a9a015cad63eaffb03ed63120e5962fda4ca3aef6ec5da1d70056ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple embedded URLs, with one notable URL pointing to 'druttle.ru' which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest an attempt to disguise malicious activity as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=what+is+internal+combustion+engine+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473039/normal_603acb182dd4c.pdfIn PDF document text
    • https://cdn.sqhk.co/minederepa/tuvidLh/fine_chromatic_tuner_online.pdfIn PDF document text
    • http://talemine.getenjoyment.net/english_grammar_and_composition_class_8_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/f4gfgdO/guess_method_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420588/normal_5ff39b8ea9c77.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/aYehdIz/27952599190.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/hbtjaM9/22163807613.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/ichj7ij/mubedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fec155a0ee67.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/gdNBpMr/52132420167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_602d2886d1aaf.pdfIn PDF document text
    • http://fawopomowuri.iblogger.org/69662955277.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/nizul.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
    • http://jepisaf.epizy.com/kenai_river_king_salmon_guides.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/fezemojevafuluzepiwonezam.pdfIn PDF document text
    • http://mibodezoboro.rf.gd/51563644319.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/kipuduwokudikomozoda.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_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 5604 bytes
SHA-256: 35dc645529ea6609f4fdb24f6b16ded7885afb82b5854a59eaf804011e61e34d
font_01_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 10888 bytes
SHA-256: 86695bd0cf62cb591bd44771174f50d4c18c8bed1cf1c1d28b703a0946c88b7d
font_02_sfnt_off00014479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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