Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f085c3afd3631d…

MALICIOUS

PDF

71.8 KB Created: 2021-03-22 14:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3601fc6037f647773a79ef6f1c537cb5 SHA-1: 2ef6273d6d13b6a8e5a335ea266fa683489e42c8 SHA-256: 16f085c3afd3631df9e265c3eb18c1d91a775bf09ebc2ebc6edccc740dc773af
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's primary purpose is to act as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=dapple+weiner+dogs+for+sale PDF link annotation
    • http://padlamadla.site/where_can_i_buy_an_ipod_nano_7th_generationg5p0k.pdfIn PDF document text
    • http://instapriz365.online/samsung_bd-j5100_remote_not_working1c9ce.pdfIn PDF document text
    • http://ukrinsure.com/83146001075808mh.pdfIn PDF document text
    • http://podarokinsta.site/what_does_it_mean_if_your_smoke_alarm_is_flashing_redxtrnz.pdfIn PDF document text
    • http://elinekici.online/where_to_place_pads_for_tens_unitekr1d.pdfIn PDF document text
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/rabefiwig_vudagasoja_zeveraxetekobi.pdfIn PDF document text
    • http://apkweb.net/37762044062zjw9i.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/jemifopudamivo-kalebuvi-wepisawu.pdfIn PDF document text
    • https://dubelaxelafef.weebly.com/uploads/1/3/1/1/131164372/9342507.pdfIn PDF document text
    • http://expressday.online/82334911444irlzc.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/entrepreneurship_mba_books.pdfIn PDF document text
    • http://liketime.fun/76464692736sovh7.pdfIn PDF document text
    • http://selectgetc.top/13444415804ba4p5.pdfIn PDF document text
    • http://eeeeeyyy.space/mazitaviragozedezopull75c.pdfIn PDF document text
    • http://e-devletodeme.net/12349366882h2g0b.pdfIn PDF document text
    • http://copyrights-notices-helps.com/rujobolixegubatiremizozudx249b.pdfIn PDF document text
    • http://bowuvudofi.scienceontheweb.net/xaxajetatofufaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potiwivig.epizy.com/propiedades_y_beneficios_del_aloe_vera.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/clipart_apron_template.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/pazuri.pdfIn PDF document text
    • http://zaravugudag.rf.gd/frozen_sheet_cake_images.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/building_computer_from_scratch.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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 5300 bytes
SHA-256: 9900bb25387eaa7b3a01a45c40859cddb3f4839316d52637990ec1b5669577bc
font_01_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 10948 bytes
SHA-256: 327192da298cbfef8362b0ec4bdf2df28e34872475eb5f621adda4856d9b97c7

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