Malicious PDF — malware analysis report

Static analysis result for SHA-256 4486301ffedada97…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 08:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1e21acee805a6178179c619d25a8dc0e SHA-1: 917045e38690f73715a8a5ce76f4b90d1f8cfa94 SHA-256: 4486301ffedada9727a06450334240c1b6e7872c4c18e4df041a356504a5bf01
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, including one that appears to be a search result lure. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/award?keyword=peristiwa+bandung+lautan+api+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487905/normal_6044dcb8aee55.pdfIn PDF document text
    • http://dazakefafan.22web.org/48740227695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410730/normal_5ffde3a08aa6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_7d3124b27a204596a39c21fbad34c57a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2c50d0-aa85-498f-b806-de1dee2e7e59/limapid.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_f9a7e23185af463fa68652be74e7db6f.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_3822abd3deb14ec982242f90f7fadc04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd554a79-717e-4e9d-bfd2-5b12e43c5952/zasipidisewuvadeb.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_11d98fd4369a487fb25a7ca1a391d8e1.pdf?index=trueIn PDF document text
    • http://dejupaxifitat.rf.gd/dozururokiraret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c654c3bb-b1b4-47b2-92a5-1e17efbedea0/bose_wave_cd_wont_play.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_fad6e3f66efe410185424e01fcaa2c8a.pdf?index=trueIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_fe516b00131340279dc837c3d787265b.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_f5f052bc99ab4702b881339482b42359.pdf?index=trueIn PDF document text
    • http://betiger.epizy.com/alpine_valley_seating_chart.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_61febfca8d844321a61d2a44b5069880.pdf?index=trueIn PDF document text
    • http://fobexegedun.epizy.com/roxoxewe.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_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 5444 bytes
SHA-256: da102358c6bb59c41513aaa6e90275ee8c47f9cfe91f5083d691e4aaad27b548
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 10832 bytes
SHA-256: 7a54ef7fd2e6a3f620332ab0bc456036f162b8f337d0cdf96584b684a3e4bec3

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