Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e64898811fc663…

MALICIOUS

PDF

81.7 KB Created: 2021-03-25 09:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e90b00bb9f087c816eddf1a5970853b4 SHA-1: 28728154c80e3c035f609fdc30867b0749ee3f38 SHA-256: e5e64898811fc66336acbf18cbd109b86924e88311aa353b2acda191f7e4bbd0
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrusted hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

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://maypoin.ru/wix?keyword=anglo+saxon+village+life
    • http://smirnoff-optic.com/ziraklmmd6.pdf
    • http://teplotronic.ru/255346500697o6v7.pdf
    • https://cdn-cms.f-static.net/uploads/4405459/normal_600e9c78c6c15.pdf
    • http://memiwuv.mygamesonline.org/gujaboju.pdf
    • http://badgesverified.com/fopedizigukosivuzoba1dvrq.pdf
    • https://cdn-cms.f-static.net/uploads/4479226/normal_602a0a865f1e9.pdf
    • https://static.s123-cdn-static.com/uploads/4401723/normal_5fee048e7283b.pdf
    • https://static.s123-cdn-static.com/uploads/4454965/normal_60065e2463342.pdf
    • http://cardioactiveuficiale.site/program_radio_shack_pro_97_scannerpt5k8.pdf
    • http://nipizakevenuvis.scienceontheweb.net/sozipasorupebibaz.pdf
    • http://bikomowaxibujoj.medianewsonline.com/ford_maintenance_near_me.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_4da9720e8c884beda9f4f86363d8b7a6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c0b773dc-ef78-4d60-aa62-7736402d28dc/organizacin_de_una_empresa_turstica.pdf
    • http://lijixame.epizy.com/8231298634.pdf
    • https://uploads.strikinglycdn.com/files/63b79e11-b368-4b5d-91e0-d7ad81942104/lakiberezedodiz.pdf
    • https://uploads.strikinglycdn.com/files/8482b954-4ed5-4679-90d2-110f81f76842/pathfinder_2e_advanced_players_guide.pdf
    • http://xaredekol.epizy.com/tesis_del_bullying_escolar.pdf
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_30a0348d6f364d9c971475a976858b27.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b8815e82-60f1-42f1-a932-465d2c36cc12/56986768605.pdf
    • http://zewajus.rf.gd/zabuvufoti.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f717.bin
cb9a7a8f017f82f0177674a3473a9c4c27c46763eff06029840a262d92c21985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 4664 bytes
font_01_sfnt_off00010705.bin
d87469dfc19eed5ebfe87723de0b88412e9367f1ebfdae984ff59fd93ec0e084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10804 bytes
font_02_sfnt_off00012bd1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 4324 bytes

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