Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0f7f34fbca73df…

MALICIOUS

PDF

87.5 KB Created: 2021-05-17 22:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6fbe4999bdf66dc42884b70a6e21328e SHA-1: da0c14c97e3dfcb5d94c7cc58d305dabeb1f477a SHA-256: 4c0f7f34fbca73df1f6254b993e24b3ae5b05a242430471399c5716b5d6896e9
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'botokaw.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. No scripts were extracted, but the overall structure and URL reputation point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=capitulo+3b+realidades+2+answers+page+60 PDF link annotation
    • http://najapizarut.22web.org/bamuwefelodu.pdfIn PDF document text
    • https://pufujodixig.weebly.com/uploads/1/3/1/4/131438007/gitunulisemigol-feramopad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_601bddcd73f95.pdfIn PDF document text
    • http://lutonetofon.iblogger.org/widejimufiribosig.pdfIn PDF document text
    • https://pepolugevukur.weebly.com/uploads/1/3/2/7/132740925/kufipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_601dbb38ab9c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_60411aaf512b9.pdfIn PDF document text
    • https://rejobasagiletez.weebly.com/uploads/1/3/4/6/134642313/xinav_sidikuwugavumax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406793/normal_6000003f8d549.pdfIn PDF document text
    • http://fixebojamofi.iblogger.org/lesomogixedozepufolanine.pdfIn PDF document text
    • https://kixumiziri.weebly.com/uploads/1/3/2/6/132681985/09fea8758.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/dukexajuj/witcher_blood_and_wine_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b96185d-ff55-421f-9a62-682ad0ebef33/zipudiranotopinodoxotu.pdfIn PDF document text
    • http://febuner.epizy.com/visio_influence_diagram_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c1a3ea-5f48-42b1-b0b6-35ab14a885b6/how_do_you_flip_real_estate_contracts.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/73079534960.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/metal_gear_solid_5_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ac709f-4324-4a4b-8258-08f344b82d8f/what_is_the_purpose_of_a_density_lab.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/read_greek_septuagint_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72138597-b0e4-4a4f-9cb7-fd5013c7ca88/beyond_5_3_1_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5e84e7-b2f8-45c6-94a5-53db35f1c2ac/50763409338.pdfIn PDF document text
    • http://getetir.epizy.com/vernier_callipers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/college_application_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbc3fc6-c536-4b8a-babc-c7c6e97e993d/18332574832.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_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 5856 bytes
SHA-256: e48cc9f27287bd1ba8b89ac35e4e8a2a850a102916fb7ed276968ddf015624f5
font_01_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 12192 bytes
SHA-256: 2b6cff61ece33ff194420f3006daae5fcef6c9a9ba0f0ce988766f9be619d950