Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75a233e2787c0e6…

MALICIOUS

PDF

81.2 KB Created: 2021-02-21 22:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b1c81982b6c3e3a593ac2f85ec9f7964 SHA-1: c5615e2a9efd6a8bf01356b36cc95825ba88527e SHA-256: d75a233e2787c0e6b37a878a0526068d2c07ead94fe00ce299448d9b3a5ed0a2
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services and one specifically to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The embedded links are designed to direct users to potentially harmful websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+does+the+influence+tactics+mean+in+spanish In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_60117c72b3640.pdfIn PDF document text
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/9407997.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/fR24jbi/87717035392.pdfIn PDF document text
    • https://nomomiwadij.weebly.com/uploads/1/3/3/9/133997716/629b1b06.pdfIn PDF document text
    • https://dowusasetitemej.weebly.com/uploads/1/3/4/3/134307927/sokilobewasewedo.pdfIn PDF document text
    • http://vykupavto54.ru/police_car_racing_3d_game_download35jav.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/bivegipupekem-xofufaxez.pdfIn PDF document text
    • http://bonboxstudio.com/loduma5hkl.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/9245854.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/47470fa.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/xorotixowa.pdfIn PDF document text
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/tupodukevem-rixigagokadeze-gidiki.pdfIn PDF document text
    • http://winclean-shop.space/kugiraxejamulovejurhtvj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_601da9325f63b.pdfIn PDF document text
    • http://in-arenas.com/car_parking_multiplayer_gear_ratio_guideax2wo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 5312 bytes
SHA-256: f84c216c9516c3e394b27ff6ad989cdce6e894a82238d7701eabdd07669a2811
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10640 bytes
SHA-256: 52f9a4291d1c40cff428acb13bc353dbf0b369c94b3c66e23be49d3fbfa6cae1
font_02_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9

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