Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71a2c77380f0d6a…

MALICIOUS

PDF

75.9 KB Created: 2021-04-05 09:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 91f2db8214c8edfc37b965edfa8edf12 SHA-1: 5ba2c44aa6843d4a9730d2a49ce03fbdd899dcd6 SHA-256: a71a2c77380f0d6a2a99033332a9d2c2063c43397a5305093702a126b6fcfc54
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm on disposable hosting and points to known malicious redirector infrastructure. The ClamAV detection and ML classifier further confirm its malicious nature. The embedded URLs are likely intended to lead users to phishing sites or download further malicious content.

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
  • 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 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=burning+series+app++ipad In PDF document text
    • http://vuxijagodoku.22web.org/7_characteristics_of_living_things_worksheet.pdfIn PDF document text
    • http://bigowet.xyz/492106692k2xyg.pdfIn PDF document text
    • http://topvideo.design/nusamixebogiguwf60c2.pdfIn PDF document text
    • http://vobonenagixavus.66ghz.com/53641408024.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/8174338.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/3102656.pdfIn PDF document text
    • http://juzajikadig.22web.org/rosazodegikotuju.pdfIn PDF document text
    • http://sbrf.link/xudewifafuvafufatuparux59oxc.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/gdiThhs/gozobuzikev.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/pisejigam.pdfIn PDF document text
    • http://visionnew.xyz/dremel_400_xpr_reviewiq05m.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/3d8a3db949.pdfIn PDF document text
    • http://teagreen.space/small_high_school_map_minecraftj4yof.pdfIn PDF document text
    • http://dazomasuw.22web.org/34972577305.pdfIn PDF document text
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/jexapedi.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/jhhjlp3/23627582761.pdfIn PDF document text
    • https://cdn.sqhk.co/lolatonuvesa/gcgiheh/7684600611.pdfIn PDF document text
    • https://ligibodi.weebly.com/uploads/1/3/4/4/134469997/9995232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joriboka.epizy.com/direct_and_inverse_variation_worksheet_algebra_1.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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 5144 bytes
SHA-256: f99b38c80bdbdf43c90c4c3577b5248516ce26e03ed63b7a1f42c270ad239a6d
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 10752 bytes
SHA-256: 60495a4f60293b754938d5286f7db33d918c1f8a23766c0aaa1336f67ec0ed58

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