Malicious PDF — malware analysis report

Static analysis result for SHA-256 f823f60c21d5bcfa…

MALICIOUS

PDF

73.4 KB Created: 2021-02-20 21:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd670d2bb5d9be56b1a93c5efbf462f4 SHA-1: e3c49f1d7b1dc81015b8da6d342a7f69eee7284d SHA-256: f823f60c21d5bcfa798d79fc477243fa12d9a6cd6e22f5c635b0b2f47618b7c8
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

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://baarspo.ru/strik?utm_term=book+review+template+5th+grade PDF link annotation
    • http://nazhivy.net/974776688555o29l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fe17c907a1a0.pdfIn PDF document text
    • http://vquest.website/debedavozikigakivusibezr1lh.pdfIn PDF document text
    • http://domen3.club/81375586454olsci.pdfIn PDF document text
    • http://italywow.info/dukemixasogivubigurewoiosdl.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/a_thousand_pieces_of_you.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/how_to_shutterstock_videos_without_watermarklsw2i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_5fd9070845e6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421623/normal_5fedfcea83b80.pdfIn PDF document text
    • http://rutenowataba.iblogger.org/tested_advertising_methods_by_john_caples.pdfIn PDF document text
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/gajoxunavuvejosepogu.pdfIn PDF document text
    • http://gratoramaa.website/penny_dreadful_tarot_cards_instructions4lz1c.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/3255057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_601d5142b01fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegubexov.epizy.com/23450127894.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_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 5584 bytes
SHA-256: c79e86c1eada1ac439915bf3d63341739685df70a1428cc3d9c02ed1c67a3b00
font_01_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 10748 bytes
SHA-256: 4fbdcfb39cc667c98b765047c33b53e2221e48caa8f9915fabbe3e02dcff9939

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