Malicious PDF — malware analysis report

Static analysis result for SHA-256 780ef2e93098c7e4…

MALICIOUS

PDF

75.6 KB Created: 2021-05-05 15:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a44b312ca324796927278413f6df1891 SHA-1: 815e0413d6b0cbee0baa098edc84de0d7e12ea2f SHA-256: 780ef2e93098c7e40a03f877a4bb8bb79089057061fec0c4565ce15290561219
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary malicious URL identified as 'https://nipisod.ru/strik?utm_term=rolemaster+character+law+and+campaign+law+pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=rolemaster+character+law+and+campaign+law+pdf PDF link annotation
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/iiC4iaT/bipanikinibuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_60031e509861f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5ffe7995b665a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_603e375cec84d.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/bibliology_and_hermeneutics.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/maruxopagadegokoz.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/Hjbjhje/kalinka_piano_sheet.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/jumedemimo/wipro_synergy_contractor_timesheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/kixawavukejekeda.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/dulilixuneduzor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7fdd88-fee0-4f96-9c7f-a57b4309fbf9/el_lenguaje_del_cuerpo_julius_fast_ensayo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ada309-75e3-48f8-ac56-76b2a536c7a0/savotewitulawumedivugep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63872a1-32d5-46e2-8519-141ec420bfda/31300541970.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/simon_says_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31eb36a9-da8d-4284-9295-dd6e900a00ce/describe_the_solution_set_of_linear_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd21a05b-2704-4710-bb23-58f211fcc027/julius_caesar_act_4_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a57504-69dc-40aa-b9fa-79c4ca2c2c79/pidifefaxakitagomomola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063fa62f-b093-4b23-b760-032d7b79b795/how_to_reference_an_ebook_chicago_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3160c1-bc7d-4f12-8ae2-29c12919091b/tiguwolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e011e2-be7a-4ba1-8a98-8825d0e92264/goodwill_legal_synonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b21b300-4dc8-47b9-bffd-fdaa69c7de09/15942356084.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/32092394349.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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 5668 bytes
SHA-256: d88ffff8254b6d07243cd6b0dda1278dc08c94497efa2bf3b9cfde17d09c5fb4
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 11232 bytes
SHA-256: 58beb1d0286acb62b863049fed6ae37bca147355fcd676087d63f714c5d9bd7d