Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4c27327260d5c9…

MALICIOUS

PDF

74.4 KB Created: 2021-03-02 21:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c7a0801b69af4d36d462aadb37d2cd59 SHA-1: 5683e13d14cc0de615db3b28172a29f04f3aeb99 SHA-256: de4c27327260d5c9304d2cce73a4378348d91a1f5a13e768b0ee028ab14edc8b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/123?utm_term=des+vermis+mysteriis+seite+87 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453885/normal_5fd2f823dc79f.pdfIn PDF document text
    • http://winsbig.space/new_viral_my_video_organic_views_generator3iw15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369328/normal_5ff5cf813dd92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_602c82bb70644.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/toxaweluxanuturezoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5fd70ce0de0b0.pdfIn PDF document text
    • https://borotopod.weebly.com/uploads/1/3/3/9/133997632/sobas_zokotonixo_kasifofiwuk.pdfIn PDF document text
    • https://budovabi.weebly.com/uploads/1/3/4/5/134510119/dowuvukifafa-rarozuladeref-kubawiw.pdfIn PDF document text
    • http://tehnotop.store/b_d_singh_biotechnology_free7tcis.pdfIn PDF document text
    • https://xoxatujetila.weebly.com/uploads/1/3/0/7/130775098/tixap.pdfIn PDF document text
    • http://everydays.space/ver_pelicula_el_principito_espaol_latino78b6a.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/rurisojewenumedazufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_60216e7a96ad8.pdfIn PDF document text
    • http://monoga.space/govupotikajoruruwonofudhtj3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5ff4cefb13c66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_602163227869a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 5024 bytes
SHA-256: 76d7668cbaf0a49f1df3da58ac001fa2ab4f89938c7f2a3f9b5f90d7339d0b37
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 11468 bytes
SHA-256: db101f224527cb46583b81231c7247a112cf995f66d5740eb9fc8def5c742109

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