Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f3a7aeeab1bf4d…

MALICIOUS

PDF

73.7 KB Created: 2021-04-20 06:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 84e4c17468334dc0b7953c719d7c22b4 SHA-1: b034f348858821938dcb3cc57fe1e8ed8db650ce SHA-256: a8f3a7aeeab1bf4db85890a4fbc718462fefb5e4bbbf239c24c23ec42787275e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external resources.

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://xajibur.ru/strik?utm_term=the+devil+wears+prada+band+the+act+lyrics PDF link annotation
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/2261792.pdfIn PDF document text
    • http://stroiline74.ru/function_operations_and_composition_worksheet0wf98.pdfIn PDF document text
    • http://itravelimpressions.com/texto_argumentativo_el_abortomrpy7.pdfIn PDF document text
    • https://ledomibab.weebly.com/uploads/1/3/4/8/134858948/zanabeso.pdfIn PDF document text
    • http://nextauto02.ru/4173990656ev3r9.pdfIn PDF document text
    • https://xemelavu.weebly.com/uploads/1/3/1/4/131437726/bibirub.pdfIn PDF document text
    • http://russianpatentexpert.com/asus_m5a97_le_r2.0_driversysbac.pdfIn PDF document text
    • https://rezepurobej.weebly.com/uploads/1/3/5/3/135327696/66484.pdfIn PDF document text
    • http://fukatamuvubigo.iblogger.org/garmin_drive_assist_50lmt_5_in_gps_50lmt.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/9d39224e-f85e-4a83-96ef-332b8f02e34a/90790876355.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_7dfae24976ac437ea504152a2a179442.pdf?index=trueIn PDF document text
    • http://safasufozoz.rf.gd/ntse_stage_2_answer_key_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e71c52-e636-472a-b04e-519effb783af/what_does_the_class_president_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eff44d1-98ea-4f3a-943e-bf963aeaaa0c/51998516855.pdfIn PDF document text
    • http://zitovidenelanus.rf.gd/vukovozibosumabumilas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde6fa00-f051-4d50-97c7-5fb4d36d03ae/tuwuni.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_946f1fb44c8a40db8e91f4c2cfc6a9a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ab8447-bc6a-468b-b4e4-afa441c55bd6/74972809408.pdfIn PDF document text
    • http://xelemebimatof.epizy.com/19351549267.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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 5504 bytes
SHA-256: 329a712210fe95b3055bd02df59a9bc5a278f6638ca28ea08bd79da31afefcb9
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 10332 bytes
SHA-256: 6389803c106f300397083afd47c68e219c7a644850bc1695a956a39021d7fbdd

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