Malicious PDF — malware analysis report

Static analysis result for SHA-256 57377c2ee47d4177…

MALICIOUS

PDF

80.8 KB Created: 2021-03-31 11:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3d26303fa94d2839725e4c592ef53b28 SHA-1: b093df6755fd5347c0ed8c0150e27d905bc72c8d SHA-256: 57377c2ee47d4177c5ddbb4ef6799ebb2fb14da022722ac486169df69700251d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru/strik' which is flagged as an external URI. Heuristics indicate this PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=braun+exactemp+flashing+green+light PDF link annotation
    • http://palikexifumalam.mywebcommunity.org/kezofowobodobu.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/c1jbtgi/3d_audio_music_player_free_download.pdfIn PDF document text
    • http://ratapadeko.22web.org/dessert_business_plan_sample.pdfIn PDF document text
    • http://kumusivit.iblogger.org/kexabukizezisuv.pdfIn PDF document text
    • https://cdn.sqhk.co/dodanadofu/PjfCxig/free_slots_online_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/hegdgek/40882604046.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/ib8jbhj/sufewix.pdfIn PDF document text
    • http://winewelimefavo.iblogger.org/2442471104.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/iajddhc/3d_pinball_space_cadet_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/sidizoteri.pdfIn PDF document text
    • http://zenulasomizin.epizy.com/72028209332.pdfIn PDF document text
    • http://kerimanerebi.epizy.com/lagejawugavad.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/jeu_de_carte_a_3_facile.pdfIn PDF document text
    • http://volitig.rf.gd/does_python_3.8_have_pip.pdfIn PDF document text
    • http://verepuremi.rf.gd/english_vocabulary_about_food.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/11479102696.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/wotupemo.pdfIn PDF document text
    • http://xonifovozub.epizy.com/jifatapixerobadavageja.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/an_introduction_to_language_11th.pdfIn PDF document text
    • http://varewokumozikon.rf.gd/ferarobipirejojujitidit.pdfIn PDF document text
    • http://novezepif.rf.gd/total_amendments_in_constitution_of_pakistan.pdfIn PDF document text
    • http://giritinip.epizy.com/tunogujefodulenadesesuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/is_biweekly_every_second_week.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_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 5544 bytes
SHA-256: a94cdd25d134d2407d75c5bb195d8d05a8eb2cfacbae2aa7b9a219b09250ef09
font_01_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 11184 bytes
SHA-256: 309411d470d6241e3052570735b31a27c456b1200c1290441c9028f5ea29578e

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