Malicious PDF — malware analysis report

Static analysis result for SHA-256 26557256cf3e5411…

MALICIOUS

PDF

83.2 KB Created: 2021-03-15 13:10:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3d4f687711e8a5bee72f08829d5971b5 SHA-1: b2542272b9a6281e220be0a3d20cd2f025316ddf SHA-256: 26557256cf3e541172fb056da0012bd8dc6f87f67e691f8bfddd5f93a0de84b6
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on directing users to `jumiwimov.ru`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/strik?utm_term=gns+430+quick+reference+manual PDF link annotation
    • http://nipizakevenuvis.scienceontheweb.net/kidadogigum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_603fc01d1616f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_601113823c626.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/c747c6b5014.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/formato_apa_2019_numero_de_pagina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504641/normal_6025641d0859b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_603767ad1ae0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366339/normal_5fcd04d6a441a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501794/normal_5ffcf83814993.pdfIn PDF document text
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/vewojinaserapozes.pdfIn PDF document text
    • http://korixoludofuguk.scienceontheweb.net/can_i_use_canon_240_ink_instead_of_245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fce5ede2d807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8b2e14-51ed-456e-a502-9b2d5a0135e2/25191724764.pdfIn PDF document text
    • http://pujumek.myartsonline.com/is_breath_of_snow_and_ashes.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/vajozuboboxanutinewemori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582bc6e9-b2d7-486a-9dba-b029575cbba9/what_happens_if_blood_comes_out_of_your_eyes.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/cannon_6.7_safe_costco_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9401efb5-7530-4c06-ae40-63a0fb9ec316/bulib.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/king_kutter_xb_tiller_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/ib_math_ia_word_count.pdfIn PDF document text
    • http://zajupulavofawi.myartsonline.com/understanding_by_design_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6592ec0-c15b-484d-b354-7b77b3519c67/41749087955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272fb588-317f-42c6-b9e1-97018389d024/koxutiboku.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_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 5644 bytes
SHA-256: 8543db456078c0e9a9ae7b9e40a6a6764b6d8e534ea403fc0327e7042d67bd64
font_01_sfnt_off000118bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BF 11636 bytes
SHA-256: 85ab6ba1d2240c2ee7f3760ebb4b168c3f3f5a6038372f9fa7066224ed727cec

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