Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec7403a3524bafc…

MALICIOUS

PDF

87.1 KB Created: 2021-04-26 22:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 02b5d25a73b1a1f474095cc62c3dfa52 SHA-1: 5f8c845b5d159679a03d54e87ba1c11e03d3962d SHA-256: eec7403a3524bafc1b26b7f5cd6c6f9cefe2cc2189ec02bc233c6ee0e84143bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=how+much+do+conservation+biologists+make PDF link annotation
    • https://cdn.sqhk.co/jusulikipe/fjhhfjC/beli_pulsa_telkomsel_1000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_602f4163a19c7.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/boliwodakojewobekuvum.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/jigd2hj/72658655772.pdfIn PDF document text
    • http://imkl-checker.com/vexigemunijewo584n8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5ffe8ecd7d9a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_6067f09699cc0.pdfIn PDF document text
    • http://tozidak.mygamesonline.org/doputujasovevutifawade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_606733cc95ea5.pdfIn PDF document text
    • https://cdn.sqhk.co/puvijupem/Hicefb1/armstrong_vinyl_sheet_flooring_cleaning.pdfIn PDF document text
    • http://sportita.fun/57701162835d3s3g.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/7jcgh4r/74536600867.pdfIn PDF document text
    • http://zawopim.mygamesonline.org/66328098150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_603e96f41517f.pdfIn PDF document text
    • http://metarapuw.mypressonline.com/467789669.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://duwemanuwixam.atwebpages.com/stanley_pocket_door_hardware_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/lg_soundbar_nb3530a.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/filmywap_2018_south_movies_kaala.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/cisplatin_induced_nephrotoxicity_in_rats.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/crossword_app_answers_world_s_tallest.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/pidagitewo.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_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 5552 bytes
SHA-256: 5afb4d599400796627192f1723fe29514d644ad8bcb3eae3fe871ba2fac96dcb
font_01_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 10736 bytes
SHA-256: ba0b2c62a1d98b25c6184d1eadd4545cc41dae379b9e83c45939c807def6c417
font_02_sfnt_off000140b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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