Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e17c4e825262683…

MALICIOUS

PDF

76.9 KB Created: 2021-03-03 19:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e5f1f91e169f5d6fe544c3380efd92cc SHA-1: 29efc82704005d37b71c3b2bc36b93862b225c7a SHA-256: 8e17c4e825262683f85d138aba1951b9d97c729c0c3fab038040116cb1e44fd2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'merit badge' to entice clicks on these malicious 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://kuzutuzo.ru/strik?utm_term=how+to+start+a+merit+badge PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483591/normal_5ffbf9aa13a77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_60399d091e889.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/robasezodafexaxigavefnkxb.pdfIn PDF document text
    • http://tujubiluwanodof.22web.org/5408438832.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/ggijij6/strikers_1945_2_rom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476148/normal_5ffc12da46126.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/GiitIPk/justice_gun_2_mod_apk_14._0.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/60541153683.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/49975932540.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/aBHQgjn/tree_doctor_houston_tx.pdfIn PDF document text
    • http://zupedaganivo.66ghz.com/flower_bouquet_pictures.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_5fda5e5617cd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xixonu/jekinukisuvavog.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/1._the_innovators_dilemma_-_clayton_m._christensen.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_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 5308 bytes
SHA-256: 23bdea869476dbf6658057ea1d9fddb4e4128fa46ab646ba2921cfe0490b4c70
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 11248 bytes
SHA-256: fc3035c01c10ab71d968ae5105a6d40d9f200bfe2646267bd8dc874539392d12

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