Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2383692d3b6eb3…

MALICIOUS

PDF

76.2 KB Created: 2021-04-23 01:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 140bd20bf70e7ee1d474a90c03116282 SHA-1: d94f08d4acdfc5d3b4ffbec749a7eea37c375720 SHA-256: cf2383692d3b6eb3e14fe6f2d0eb21d896c0f7bfedc915d13a56e23643e966c4
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a site that appears to be a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=la+ciudad+y+los+perros+pelicula+de+que+trata
    • https://cdn-cms.f-static.net/uploads/4409000/normal_60381ebb0251d.pdf
    • http://7lessons.site/multivariate_analysis_in_microbial_ecology4zjp7.pdf
    • http://feyakast.online/rafedisazepuleloleb2wpj.pdf
    • https://cdn-cms.f-static.net/uploads/4500447/normal_600a570a1b9f2.pdf
    • https://cdn-cms.f-static.net/uploads/4446770/normal_60342f3e14497.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://ruszaimclub.ru/commercial_electric_tester_ms8903h_battery_replacementwm6e9.pdf
    • http://fineagencyy.com/7418330254085xr2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c9ecad83-e70d-4e71-84d8-0086c45344aa.filesusr.com/ugd/01a317_a7402077a2484460bfc97f2dddfe33bd.pdf?index=true
    • https://s3.amazonaws.com/jalasilunaz/nogusidupujikoku.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_4f1646726b2b4efa953e5d49c3133ad4.pdf?index=true
    • https://s3.amazonaws.com/tasufagijaremo/converting_units_of_measurement_worksheet_grade_6.pdf
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_626a2f2849c84e95a79cdf75f1f311a3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/809b4ccc-8d41-4a9e-9b55-f41b618decf7/arrowood_golf_course_membership.pdf
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_74429746e17c4d83975b494dc666388d.pdf?index=true
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_c028bd56e9164a8da9d9d7c51cab5e20.pdf?index=true
    • https://uploads.strikinglycdn.com/files/66db3db6-415e-402c-ae0f-8d2497982705/how_long_has_mason_crosby_played.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f0.bin
98d395aa895c9cc4f711af3b964edf53bc8cd2436b9dc2844b00db5b4c655a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 5236 bytes
font_01_sfnt_off0000fad4.bin
6e0753a973e22e4904013f15b7eab6ddf5cbbd4c58ed50bf08e155973526eb0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 12168 bytes

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