Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d875cf37553532…

MALICIOUS

PDF

70.9 KB Created: 2021-05-11 00:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cdc2dac07189653d8111c6af01113a4b SHA-1: 7df8b9dab63e04d0c2ad113a32accaf40fa12bb3 SHA-256: 83d875cf3755353215ce522b9623edd5298800c010fddeea79846b0f7f544790
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to potentially malicious content, and the PDF's structure is indicative of SEO manipulation or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=yeti+microphone+cord PDF link annotation
    • http://levotavo.scienceontheweb.net/67158248274.pdfIn PDF document text
    • http://laregazobo.22web.org/arabisch_deutsch_visuelles_wrterbuch.pdfIn PDF document text
    • http://tepuragebu.iblogger.org/alternative_medicine_in_australia_answers.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/telecharger_les_journaux_algerie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_604cdb54296fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464863/normal_6037493f894e2.pdfIn PDF document text
    • https://zozumaled.weebly.com/uploads/1/3/1/3/131379894/8378494.pdfIn PDF document text
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/varaxesamanufebob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_603e8eb42b334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_6051021bd465a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_603ed7d134ab0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_f1692f18084b485f83170d78cf3c97f1.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_929a5594ed874fb68f1076c8bd146ea1.pdf?index=trueIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_207b93596ee34889a71b406321b9dc97.pdf?index=trueIn PDF document text
    • http://jezowadu.epizy.com/chelsea_vs_liverpool_2018_video.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_87d69a99b07b4802a5e0b129b72ea9d4.pdf?index=trueIn PDF document text
    • http://webewizago.epizy.com/acordo_de_basilia_iii.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_1882aac3d25d4a3e89dcbe7091d0bfb8.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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 4856 bytes
SHA-256: f9f2daaf87f432873f9a46b811fe798dfab506a1a9afbdd9c2f88c3335161e02
font_01_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 11116 bytes
SHA-256: 56fe2c7e88d464ba534aa24309f3a93898b28ae7e75591f680d2dd80f7cf86ee

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