Malicious PDF — malware analysis report

Static analysis result for SHA-256 3917f4b217657887…

MALICIOUS

PDF

97.3 KB Created: 2021-03-04 14:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 71423adc5ab28cf2ace26c8c9d73d645 SHA-1: 8caad333778b89ae62e8e1b30e6d1a02e119fb6f SHA-256: 3917f4b2176578870f52583254ecaba4297d087f21212fc21727e46b7759b6d6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of multiple suspicious URLs points towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=90+minutes+in+heaven+movie+review PDF link annotation
    • http://lovelid.xyz/43414025004xe0pe.pdfIn PDF document text
    • http://demask.fun/kawavevivilepelugezumupaqb347.pdfIn PDF document text
    • http://ttttrrrr.space/34294302311ifwxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370275/normal_5fe4f4f8c0f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5fdc1c99e2bca.pdfIn PDF document text
    • http://smartcreditcheck.info/6029664670167bjh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384831/normal_6001c82cd35c9.pdfIn PDF document text
    • http://thefortykuti.com/652839482574fe9m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_601de39e84baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_6035f0588ebdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_4d49ec4e45064f00845b04f74dbdeab6.pdf?index=trueIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_dfaca8e00bdf4aad9e4fe13f483242b1.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_22d77ba2ec95415685d851987401e4bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a528d3-c2b8-42e2-a213-4068a9bde907/78579030565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ea6d88-be01-4a2a-b16a-b99fd4a3148b/how_to_find_the_volume_of_cubes_and_cuboids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59fa99d6-e538-4537-af42-9ea0cffa4bc2/how_much_does_it_cost_for_someone_to_make_a_logo.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_62a8ec235ebb42f5906487d29112872e.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_off00013ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECE 5248 bytes
SHA-256: 391ac2158acd7f70b898ec5365c616d029bdf71ab5d4b3dd7c4193143e5eb1fc
font_01_sfnt_off0001508b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508B 11708 bytes
SHA-256: e8c0f7fe231e3e9504b06b9fb36df29868488c1d4d96980e7dc42deba9190293

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