Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ba32548f56c949…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 07:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8f8dd1d0a86a8c52ada4c714e03211eb SHA-1: b081efc64bad26a103af7508c90292092f3a27cc SHA-256: 76ba32548f56c94970aec5d82bee3b605b2eeceb175ffdebb665b4fe9308b88b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dafemum.ru/strik?utm_term=software+testing+jobs+salary+in+chennai PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fcc6265592c6.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/jgjhD5L/15689266025.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/hair_cutting_kit_sale.pdfIn PDF document text
    • http://felixojo.22web.org/acrobat_reader_trial_version_free.pdfIn PDF document text
    • http://muwazowezijowa.22web.org/15353557729.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/24787811588.pdfIn PDF document text
    • http://totakonepis.iblogger.org/10_most_important_events_in_us_history_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/Kichfij/tizopufobezaxexegobig.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/tikuramodemuz.pdfIn PDF document text
    • https://cdn.sqhk.co/lojavowi/2yhgqgD/777_casino_schweiz.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/64820711458.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/7rjhhji/ey_strategy_consulting_internship.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_6015299e34ad0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5fff935475cbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasifowon.atwebpages.com/how_to_integrate_cosxex.pdfIn PDF document text
    • http://joveteki.epizy.com/87476350148.pdfIn PDF document text
    • http://zosetuguvajisu.epizy.com/decision_tree_implementation_in_python.pdfIn PDF document text
    • http://jaxejibowanub.rf.gd/98574153843.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/star_trek_into_darkness_cast_carol_marcus.pdfIn PDF document text
    • http://lisudanuzi.epizy.com/kobikofer.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_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 5656 bytes
SHA-256: a8dbdb9154a9c756427e82b6e6f644bf4a12fe437ae225cd15c4632e2cf10f7b
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 11100 bytes
SHA-256: 32ee9e234c571bad999fa382aab077c533efd633cb6df37857b773c23af0c208

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