Malicious PDF — malware analysis report

Static analysis result for SHA-256 825971dadbe033c4…

MALICIOUS

PDF

64.5 KB Created: 2021-03-12 03:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0a34d0e1a6346ab3be7a0a5ce8c4578f SHA-1: a9f4cfba2eea52dcc4ed93584d35d8f6cdd0b087 SHA-256: 825971dadbe033c482c77c4559c3d5b0d223c37b64f3d0c11f274c8ad6a71346
184 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to dafemum.ru, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this document, likely intended to redirect users to harmful 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://dafemum.ru/123?utm_term=kadamban+tamil+movie+hd++tamilrockers In PDF document text
    • http://nizavevorupuj.mywebcommunity.org/navuzigijazap.pdfIn PDF document text
    • https://nigupisotaku.weebly.com/uploads/1/3/4/3/134374455/kawuzoki_mixox_kuzobadugex_gunuv.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/siwakuwamaxexubar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455883/normal_5ff6253a80468.pdfIn PDF document text
    • https://namavikevak.weebly.com/uploads/1/3/2/7/132740743/xogezuzuj.pdfIn PDF document text
    • https://sewokowoxukipa.weebly.com/uploads/1/3/4/8/134846336/7913080.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/1828563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_603cb2ba4c08c.pdfIn PDF document text
    • https://maxamiboxu.weebly.com/uploads/1/3/1/6/131607029/5182019.pdfIn PDF document text
    • https://towodoruzaxigol.weebly.com/uploads/1/3/6/0/136050186/difeza.pdfIn PDF document text
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/kerelolufowa-kawova-lifaxejezobusul-betitom.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/dewazewokib/lightly_row_flute_sheet_music.pdfIn PDF document text
    • http://gojaxuga.epizy.com/tokyo_guidelines_for_cholecystitis.pdfIn PDF document text
    • http://dekuroveki.rf.gd/pisuj.pdfIn PDF document text
    • http://lulovijolezon.epizy.com/tonal_harmony_workbook_answers.pdfIn PDF document text
    • http://gakelapirafit.epizy.com/how_tough_is_arabic_to_learn.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/get_your_guide_dubai_yacht.pdfIn PDF document text
    • http://fukesok.rf.gd/bajada_de_cargas_de_un_edificio.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/airplay_mac_to_android_box.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/fetijakumagugu.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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 5412 bytes
SHA-256: 97271260e2ff48ac98478d56432c8875a773a14f75ea23ec95b620946c5e2706
font_01_sfnt_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 9812 bytes
SHA-256: c12ca6724f8dc186e5703bdb9ca8727852baebac4245f2e88e375c4c6b0fa4ab

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