Malicious PDF — malware analysis report

Static analysis result for SHA-256 5468ccdc8bfbffc3…

MALICIOUS

PDF

102.2 KB Created: 2021-03-04 02:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 257922da9758b3e03167bff038a7d34d SHA-1: daaee2f3652690fb824909638fda8e5a89566c8a SHA-256: 5468ccdc8bfbffc3ad25f4532fd109819881a5d02c3cec7d830203b9e66154db
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, indicative of a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior, suggesting a phishing or malware distribution scheme.

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://gimoguvi.ru/strik?utm_term=what+are+the+laws+of+islam PDF link annotation
    • http://taxurofetizi.22web.org/bluetooth_driver_for_hp_pc.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/what_is_base_rate_neglect_example.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/87007939947.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/yViiFkW/shop_fox_wood_lathe_parts.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/2121596427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_6029ee0421273.pdfIn PDF document text
    • http://tinubovibiwiwi.iblogger.org/54019573017.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/55224855967.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/lds_2020_general_conference_dates.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/ibhhGjc/jojijinow.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/hfliigd/rugby_world_cup_2015_trophy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/jcDFhc2/domino_pizza_stock_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tibibexubedumu.rf.gd/beats_hd_movie_free.pdfIn PDF document text
    • http://semerobaragizeg.epizy.com/88237698519.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/zotudu.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/98967188577.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/darth_bane_rule_of_two_download.pdfIn PDF document text
    • http://turijebudeta.rf.gd/apk_pure_instagram.pdfIn PDF document text
    • http://womopemi.epizy.com/73532701537.pdfIn PDF document text
    • http://voruluju.epizy.com/kcpe_english_answers_2018.pdfIn PDF document text
    • http://wigeriwo.rf.gd/ziselugomedazejiwelo.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_off000155a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A4 5112 bytes
SHA-256: c6eee2fbb83e4d61e19b74b862b89b4ba499ab546671ac0c1fd303b556d19e55
font_01_sfnt_off000166f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F4 10648 bytes
SHA-256: eaf46f9bf426465ae67e40272128c2d595d83fe8bd3d2636a7be209534eb6824

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