Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a81181c3404df0…

MALICIOUS

PDF

73.6 KB Created: 2021-04-22 03:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 503ee8459401d36559226cc44a3aa4da SHA-1: a8ab7501bb3dbc390884659037f781f17362146e SHA-256: 72a81181c3404df0d1b4611ec426a3830102a1c7bc1e0c5e33a2c13eaaaf23db
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, including one to 'nipisod.ru', suggesting a link farm or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

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 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.
  • 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://nipisod.ru/strik?utm_term=how+to+reset+jam+heavy+metal+speaker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491169/normal_6043dba8cfd3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_60607abf223e3.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/ihhhAVi/55274630996.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/Njcrnca/xibuziviv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwaxujunexozet.epizy.com/jisitegexavilup.pdfIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_82828d6e9be641b79b657b989e1c74ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/44001560057.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/tumosafaza.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_981eb818b80349d39b4787ba927a3900.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/olivetti_lettera_32_manuale_italiano.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_c327998531c842a1a2fbf29d695fc2ab.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_1b089f2e63fe43b1968027f63f0e32e8.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_d9863d55c976439cb2602451df7cd763.pdf?index=trueIn PDF document text
    • http://debetofewozuri.epizy.com/32788652012.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_b9c9b97821634ef49c58e0c2ce93faaa.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_124955f6ff5c418a9f6d674107d2cc2d.pdf?index=trueIn PDF document text
    • http://zakivijojinikij.epizy.com/medical_company_profile_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/demonstrative_adjectives_worksheets_for_grade_4.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_e69e5caa49f841b58d5fc9f3bf1f19d3.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_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 5416 bytes
SHA-256: 1168edea4008fb55908a64674e84bc99ad3a1af088ff8f197f2396b989db5fc8
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 11024 bytes
SHA-256: 5924c2b314fe09011529f47bdd17f28fdfa09b698257cea1947570100b56e025

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