Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ca08765c18ca6a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-05 11:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0886f89876a9c80fb0e65777d612a653 SHA-1: 08e7346c59465f0367add3b0bdc9992aa5b00531 SHA-256: 16ca08765c18ca6a6dd437cb0a61b29cc8d7abc320d5d618669c285de4b5c3c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which are hosted on disposable or low-reputation platforms, suggesting a link farm or phishing campaign. The presence of external URIs and the ML classification strongly indicate an attempt to redirect users to malicious content.

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://fokemale.ru/strik?utm_term=burnham+series+2+gas+boiler+reset PDF link annotation
    • http://nurokojo.mypressonline.com/transformational_leadership_theory_nursing.pdfIn PDF document text
    • http://dakaxakorasokad.22web.org/business_sale_and_purchase_agreement_template_nz.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/92816986504.pdfIn PDF document text
    • http://zuvatewovu.scienceontheweb.net/kenmore_cordless_stick_vacuum_parts.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/nibolenuluweretujov.pdfIn PDF document text
    • http://jesiguvolen.22web.org/56813430230.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/star_trek_enterprise_season_2_episode_4.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/70012470667.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ifn3hjT/nemigemolotenaraw.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/hKU0FiR/76665397518.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/judejoxitadolodaxoxizod.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/hp_deskjet_2620_not_printing_properly.pdfIn PDF document text
    • https://cdn.sqhk.co/kanojasav/ibjchaZ/bombastic_bling_how_to_get.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/gfifcib/medieval_kingdom_wars_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/f3ichdq/can_t_write_notes_on_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ginowane.onlinewebshop.net/viwuwojorikeropanag.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/jurassic_world_the_game_apk_unlimited_money.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/learn_english_online_free_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/cheese_straws_puff_pastry_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/byju_s_app_for_class_10_rbse.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/beintehaa_serial_title_song_video.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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 5420 bytes
SHA-256: ccfa3926c4fcb4b52eb9c39bcd23caa3525ffea668970411471567a8ce80071e
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 11060 bytes
SHA-256: c14452f61568440f2cb32c6295bbf1c5283c8892b1aeea987204cd8cca1c8f52

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