Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d73c67758f18ae7…

MALICIOUS

PDF

74.6 KB Created: 2021-03-14 16:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c052e16e6ecb68809b737b355fb23ae SHA-1: 84f314ea708d2b5fece03e3c8393b06e38391ed3 SHA-256: 4d73c67758f18ae72a92cdb7f47a1a109804ddbe20b945e3efa5deb000d1284c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=free+sat+test+prep+questions PDF link annotation
    • http://vizimuvorogo.22web.org/ladef.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/2HR1Qhj/wavenebawibefoduxe.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/agjhSiZ/sunexanizokizelo.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/tT0KUhg/muwofutagupokipikiserel.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/Sy9igEn/snow_ski_slopes_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/1XJxhjr/iomega_screenplay_dx_hd_media_player_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/gicDgKc/are_basketball_shoes_good_for_running.pdfIn PDF document text
    • https://cdn.sqhk.co/tuminageka/giYejeP/69310017214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_f40512651b684ddbb6163b99040696db.pdf?index=trueIn PDF document text
    • http://wozaxanakix.epizy.com/bemufutumewagomanita.pdfIn PDF document text
    • http://fapadetesiwix.rf.gd/conair_infiniti_pro_1875_hair_dryer_reviews.pdfIn PDF document text
    • http://gekepogeje.rf.gd/wevuzasajoxozer.pdfIn PDF document text
    • http://buvafejeles.rf.gd/car_spare_parts_name_list.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_35d670a119784138bb2f29b7510c3629.pdf?index=trueIn PDF document text
    • http://zigufaza.epizy.com/gitewimobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ad5117-4905-4a79-b6d8-5b5a977c5879/ruxevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f5de88-6a33-4ced-92f2-0a94365cfba2/zimasenumima.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_b06f2f8d87c64a37bdaf72edb84dd935.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/376a6e51-5d13-4ad9-a3bc-d78c2fe4638d/tipos_de_comunicacion_no_verbal_iconica.pdfIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_27d982eda6a04ff492e18c5bab0e91a5.pdf?index=trueIn 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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 4860 bytes
SHA-256: db05f93f7c6eb5e4f658641f0d39b683ef4379510459f2e7c254212069974fa2
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 10564 bytes
SHA-256: 83733d35a6f1729b4844f6da5d563d92eb82987ac0b24af1c02f4ec7f1268bb3