Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a5cee34c5c2c6e…

MALICIOUS

PDF

76.8 KB Created: 2021-02-28 02:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 66d3a2c95e0132f2cce82c63659f3093 SHA-1: f3d03b9b654e678da9a623ddfa25d4fd185a9c08 SHA-256: 82a5cee34c5c2c6efe307c2aa1932de4734dcefa19b6b76bf1f575ac62378e57
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'fokemale.ru'. This domain, combined with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=speed+queen+commercial+dryer+parts+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419640/normal_60254fe1b0879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_60122a99a2474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fe5e88e1dc33.pdfIn PDF document text
    • http://lipejunotuxo.22web.org/16376001595.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/jjyXl8Q/space_wolves_40k_army.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409840/normal_5fe30bb0a73e9.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/xijilesuzuxo/smadav_anti_virus_2019_free.pdfIn PDF document text
    • http://kutugujipix.epizy.com/67056996693.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/how_to_write_a_performance_evaluation_for_a_coworker.pdfIn PDF document text
    • http://fijinibegomiba.rf.gd/angular_4_material_template_free.pdfIn PDF document text
    • http://fajiwuwigekelal.epizy.com/practical_kabbalah_part_1.pdfIn PDF document text
    • http://xugidujesu.epizy.com/superantispyware_portable_free.pdfIn PDF document text
    • http://silapopo.epizy.com/lerelido.pdfIn PDF document text
    • http://vavazewesepato.epizy.com/20729246004.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 5424 bytes
SHA-256: a07b661d3f2903b54a711853bbd728986b3a63544a44477fb00158c930a33345
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 5552 bytes
SHA-256: b4c30476821ad2571c6693c030d897c739f9f12611a7283750fbdc1b92bfde35
font_02_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 9892 bytes
SHA-256: 36adff988d3c5c032a391c75c3dde2b3fdc7de917fe9b6f0ff55b57192582682

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