Malicious PDF — malware analysis report

Static analysis result for SHA-256 f451c4c8feb6c04a…

MALICIOUS

PDF

70.6 KB Created: 2021-01-06 10:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aff59535ad569d896067d60a9f44e014 SHA-1: 4d782e9c12394ddebe54c101aba284563ad6e1ef SHA-256: f451c4c8feb6c04a06b37a491dd0678bb7cf576f7d53c7e7be6482e93d8f5d6e
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 embedded URLs and is flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. The presence of a link farm on disposable hosting and the ML classification strongly suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to relate to financial formulas, which is likely a lure to direct the user to the malicious URL.

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://traffset.ru/aws?utm_term=formule+besoin+en+fond+de+roulement PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481540/normal_5fdf54b30cd44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_5fe785d06bccb.pdfIn PDF document text
    • https://kirugalepolofaw.weebly.com/uploads/1/3/4/3/134340862/dojokudeted.pdfIn PDF document text
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/7335029.pdfIn PDF document text
    • https://zozovuxogufeduw.weebly.com/uploads/1/3/4/7/134766710/rolazikas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5feb8ab2770db.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/2d627.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/wifiduxezo/19876811004.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/libertango_astor_piazzolla_sheet_music_cello.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/75351757523.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/68436834951.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/akreditasi_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0971a118-0b48-41b1-a3f3-e22dc021e285/wosoxajujij.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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 4936 bytes
SHA-256: b1a62d52e487bef3e3406e57656f11f2b09e70464b1c8c3bb185c03a961d512b
font_01_sfnt_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 11724 bytes
SHA-256: 4b3f45adde6669c0b2623e53091e12ae0208c67df478563e4d8d1ebc4d107625

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