Malicious PDF — malware analysis report

Static analysis result for SHA-256 146775df6e113d1d…

MALICIOUS

PDF

74.2 KB Created: 2021-04-04 19:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3a587302c0f49376a2511de371974e6a SHA-1: ab942d09474658e9a742a9f432ce2dd1908d0c26 SHA-256: 146775df6e113d1d5446a13074312e5440a127f104c85a96b8fb69690f3728e2
134 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a phishing lure, with one URL specifically mentioning 'how to fill out a declaration form'. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of multiple external URIs, some pointing to potentially disposable domains, indicates a likely attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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+fill+out+a+declaration+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445119/normal_60291c1f906bd.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/vuxatodesevugaleki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_60405109785f9.pdfIn PDF document text
    • http://tegubija.mypressonline.com/97173758480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5fddb76e23255.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/16480721880.pdfIn PDF document text
    • http://wosozage.mypressonline.com/bacteriological_analysis_of_drinking_water.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_605b8567c657b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474450/normal_5fefed625423a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_7992702fc97c443a93e5bea8d1c1d698.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/rasemurugurexoxij.pdfIn PDF document text
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_304a5a6be8484c82987afebd4bab53d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3632936c-9cdf-49fc-a63b-d6342b9e3638/9220294446.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/7.3_transmission_fluid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d55d51-7603-44c5-8214-ae28ed387616/neuropsychological_testing_for_adhd_in_adults.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/causes_of_ww1.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_8d29de3f43f14c5589d122144986b697.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_08cf4178902b495cac1eee640b6780aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/729c096a-39c6-4d5d-a94c-76bf2ca6a5d8/how_to_replace_battery_in_adt_system.pdfIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_6ef8a56b3b1843c1bd0ac6bc2aa3953f.pdf?index=trueIn 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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 5044 bytes
SHA-256: 07abadc90cbbb475c48b9c46be0e1e0e431f0a30d19ecd09192ddf22a3112db1
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 10936 bytes
SHA-256: 61c542aa44e2a26e5da3fefb3e1b0c119571fdd0a47db45d3552505c77e3ccec

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