Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03f5941a33e97f5…

MALICIOUS

PDF

78.3 KB Created: 2021-05-24 19:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3a441d0172dfcae5fd6aebdeebd1c863 SHA-1: e9a01a683759b8ff19f48eb707ece461c21aa9b0 SHA-256: e03f5941a33e97f52f9c0d44f5a09d580467dee920c23c7dfee68f873ba12776
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to textbook answers, directing users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=ven+conmigo+holt+spanish+level+3+textbook+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5ffa8587a7d8d.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/fupokupebamifisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_6022b439ebbdd.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/9089113.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/zijuluroguruma-difexizof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_5fe9156236f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_6057c244de73b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_6018517dbe6b1.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/5a38ca006791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_600c3b00daac8.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/3792581.pdfIn PDF document text
    • https://powinategirax.weebly.com/uploads/1/3/4/7/134736766/6296c674b58d58.pdfIn PDF document text
    • https://kojivijagidisu.weebly.com/uploads/1/3/4/0/134042347/9086450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5ff2caa28c4dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_6006a74451f49.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/ddc9f8d577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_5fe69433b2b1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/177e12d8-60d9-44c3-90cb-21398fa06987/five_nights_at_freddys_2_free_download_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/business_financial_needs_analysis_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/manchester_united_vs_arsenal_8-_2_highlights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53175ab6-25ad-4624-8dc2-65add0c0c56d/borojetexokexedodoxamida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca41885e-e4c2-479e-b6cd-0d9afb88dbd7/sogemorapezigowuzudokipo.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/muvivutobovumepojipido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed39f49-1aa2-4634-8271-b71251bf58f7/examen_diagnostico_historia_de_mexico_secundaria.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/solutions_2_go_pat_bonza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703293d9-a504-4ad3-a418-e4c51b192421/disco_music_70s_80s_and_90s.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/kojenax.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_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 5688 bytes
SHA-256: 3f5d13a9eab88c21568a2492373b718b2c51f7533603b846bbfac6296eeca03e
font_01_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 10912 bytes
SHA-256: 636e71a9ec87cee8913b0880f3002423cf491059a6c144a25b4d6fbd2834e86e
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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