Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb78f70af861399a…

MALICIOUS

PDF

74.8 KB Created: 2021-05-07 14:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aec3c37fcd70a736d7cfc3c6185c42c7 SHA-1: edeff87f30f57ccdc0c5f3d167a94636883b2979 SHA-256: fb78f70af861399ad76d88477ad6b9c5294f030c8ba638789f617817e1ce3681
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to cleaning a Bissell portable spot cleaner, which is likely a lure. An embedded URI points to 'zajinet.ru', a domain associated with malicious activity, suggesting the document is designed to redirect users to a harmful site.

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://zajinet.ru/strik?utm_term=how+to+clean+bissell+portable+spot+cleaner PDF link annotation
    • http://musc-media.xyz/2019_telugu_calendar_freeayy48.pdfIn PDF document text
    • http://sreda.city/gnostic_book_of_changesdu16p.pdfIn PDF document text
    • http://freds.space/xuzogazoneboxuwuwapolut6kyy.pdfIn PDF document text
    • http://everydayy.fun/what_is_edo_period_in_japan86hiu.pdfIn PDF document text
    • http://esplus.pro/el_cascanueces_cuento_originalz0ci5.pdfIn PDF document text
    • http://xagekofa.iblogger.org/zegeturolinunudetema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_0882e0ec91f94f989cd9be7ea5af1a16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a2813d-21bf-4364-aca4-e225ac8c37a4/76425660203.pdfIn PDF document text
    • http://zawofepak.epizy.com/46291256738.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/zemur.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_c7c652cbb00f46a3aba84dae715bc559.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/509942df-7f8b-43ae-acbf-39fb59540321/how_to_be_a_caregiver_for_your_spouse.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_4b65e4e4149548ceadb8bc175fc765b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/audi_a5_sportback_2010_owners_manual.pdfIn PDF document text
    • http://lisokabosexipep.epizy.com/nisupes.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_dd39b50ae7374988929c4a2e20fbfeda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/99656411128.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/food_chain_worksheets_for_4th_grade.pdfIn PDF document text
    • http://gasiton.rf.gd/lg_wade_organic_chemistry_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/70956749811.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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 5120 bytes
SHA-256: 349cbd10c636716636e1fb1a36c84f39176c4b730bce7fa3eb9df67501d2807b
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 10444 bytes
SHA-256: 62456dc85b2a7e293d599e3295cb57ea0edf2141eebbfaaff6c874f10e1dd2d5

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