Malicious PDF — malware analysis report

Static analysis result for SHA-256 4610ff0e0da38640…

MALICIOUS

PDF

80.1 KB Created: 2021-02-26 19:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5ee8c0bc978d53e76af9b79210024be9 SHA-1: 005facbaf920ee6d81866d308a29ce61fbfd3af7 SHA-256: 4610ff0e0da38640a9f091e0f22bc3f28d8f78cc4fb2b413a76e6b45132ccea8
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL on 'yafferge.ru' which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to search queries, suggesting a phishing or scam lure. The presence of multiple disposable domains and link farms further supports a malicious intent to redirect users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+the+effect+of+the+type+of+food+available+on+the+frequency+of+different+types+of+bird+beaks In PDF document text
    • http://nokasosozigof.mypressonline.com/what_is_dw1_transmission_fluid.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/ipad_mini_newest_model_2020.pdfIn PDF document text
    • http://kumokopilomeme.22web.org/72243543705.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/cen-tech_battery_charger_error_codes.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/23276884275.pdfIn PDF document text
    • https://cdn.sqhk.co/mefomixut/NJjeShU/download_music_folder_player_free.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/moto_x4_android_one_review.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/harry_potter_y_la_cmara_secreta_resumen_libro.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/how_many_questions_are_on_the_cdl_permit_test_in_ms.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/76513541745.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/XgWgdje/woodshop_ideas_pinterest.pdfIn PDF document text
    • http://kopumiwabetare.66ghz.com/gmc_acadia_2008_manual.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/rain_dial_rd-600_replacement_parts.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/how_to_draw_animated_characters_on_computer.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/what_is_stock_list.pdfIn PDF document text
    • https://cdn.sqhk.co/dizirajeb/bgjihgB/incivility_in_the_workplace_ted_talk.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/b5ghFih/pish_posh_penny_pusher_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potosalusuk.rf.gd/94815264168.pdfIn PDF document text
    • http://butevagowug.epizy.com/gagusaloridikepesura.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/suvefugopunapadunabiruva.pdfIn PDF document text
    • http://zevuvedov.rf.gd/66750075083.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/gatumanewon.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_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 5748 bytes
SHA-256: 9e7a29664b62935d7390b12a87a68e4bb48104333e431d6703e24122acc5b6fc
font_01_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 11244 bytes
SHA-256: 02b073ea7db477f985703f84ef30ee4cdd558882f8c1b5c4df45de8044e3e335

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