Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a668152b7b47b7…

MALICIOUS

PDF

71.1 KB Created: 2021-02-04 06:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7c6e1eba593588bff8bd0e0a2560c2d6 SHA-1: 998530e5006d6ee9312b97893e81811c7a6ebd38 SHA-256: 81a668152b7b47b7ff012cd7dbab623fdb2e616d2527de302ac4d131e4a51acc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and Weebly/22web.org hosting, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the document as a link farm on disposable hosting, reinforcing the malicious nature of the embedded links.

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://bologen.ru/123?utm_term=apa+format+for+bible PDF link annotation
    • https://fivixevovisobav.weebly.com/uploads/1/3/1/3/131380347/vifabowanedax.pdfIn PDF document text
    • http://sayseedokg.com/vapadowasumomasawapegunuryiknp.pdfIn PDF document text
    • http://accface.in/tazivenakapapixixau4jm5.pdfIn PDF document text
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/d0ea6f7761.pdfIn PDF document text
    • https://zutujoxiker.weebly.com/uploads/1/3/0/7/130776667/vubexijisamivazesotu.pdfIn PDF document text
    • http://1xbet-football.fun/lemon_pound_cake_recipes_using_cake_mixhumdl.pdfIn PDF document text
    • http://circulyarkadigital.xyz/edexcel_igcse_economics_student_book_answerso1jac.pdfIn PDF document text
    • http://pewagupudasita.22web.org/mudizilorokuwumoxoj.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/6577994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_6019f6c736ab3.pdfIn PDF document text
    • http://unonatur.space/859052541588p1tr.pdfIn PDF document text
    • http://fortuneo-enligne.com/18850525499efbkl.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/janapapuzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doronelibi.rf.gd/vosomerunisetojematuga.pdfIn PDF document text
    • http://duzebufulumaw.epizy.com/evolution_and_geologic_time_worksheet_answers.pdfIn PDF document text
    • http://nafabumawo.rf.gd/31599624578.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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 4996 bytes
SHA-256: 0b3b461155215614422e317c133a51c2407d39ace7fd3c500a2650a65aa09a02
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 10436 bytes
SHA-256: ad5d3061920917d13ad11711be122ebc02539d770e4ec06a34150d4b6b0850e7

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