Malicious PDF — malware analysis report

Static analysis result for SHA-256 de861164ca60ec65…

MALICIOUS

PDF

78.1 KB Created: 2021-04-03 07:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a697435104b3d9d43e7ad7ef09d62e3e SHA-1: 78009ab0a8e16b3e7d09918260bc1c029690ab49 SHA-256: de861164ca60ec651ac543f01d669cbd367d7658dbe44b352c42ffbb763bbcfb
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain that appears to be a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a legitimate document.

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://jacksth.ru/award?keyword=cavatina+guitar+sheet+pdf PDF link annotation
    • http://afracheat6.xyz/zokewewozew8gba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_604323cd6bb7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470980/normal_5fc9d9d76c372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_6059c12023716.pdfIn PDF document text
    • http://talakam.space/ventajas_y_desventajas_de_mysqlyx1ei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_60494bf026844.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/56180423969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_600f4bf577e95.pdfIn PDF document text
    • http://detodefinedex.22web.org/tuwifetavagisaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eddf967a-0270-477a-bd78-1734553b1346/78959111075.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/gofonavavile.pdfIn PDF document text
    • http://pajamenu.rf.gd/xasivesukasutavoxijexiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a8c264-c68c-4efd-852f-6292086766fa/how_to_on_smart_bracelet_m4.pdfIn PDF document text
    • http://dipomik.epizy.com/robotic_arm_design_thesis.pdfIn PDF document text
    • http://voturugivorajop.onlinewebshop.net/arithmetic_sequence_and_series.pdfIn PDF document text
    • http://pepudujer.epizy.com/chest_guidelines_anticoagulation_reversal.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_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 5236 bytes
SHA-256: db64990d50ff48097db676f69af57c1bb3166f333afd3f027390f59cf8b78cd8
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 11868 bytes
SHA-256: 23437822fb9418735c325c7beeed6137e68d62bac7b934e962d1b5de1a3d1e5d

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