Malicious PDF — malware analysis report

Static analysis result for SHA-256 2592bab9a5ca42a6…

MALICIOUS

PDF

100.9 KB Created: 2021-02-19 08:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8e4efb93f26a061c6546b980b164ac90 SHA-1: 7339a514f1927cae3dea67636dcefd8a0e43a16b SHA-256: 2592bab9a5ca42a665211863b05b00be801afb028c072617f34b30580f23c42c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attempt to manipulate search results or lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=realistic+water+two+lod+fix+xbox PDF link annotation
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/69fd174f.pdfIn PDF document text
    • https://pifofunota.weebly.com/uploads/1/3/0/8/130814871/d7beaa.pdfIn PDF document text
    • http://dedukali.22web.org/zepepubupijitabepa.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/825dbe2c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_600e89335e923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450424/normal_600915a7ba3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470028/normal_601582ab4bb4e.pdfIn PDF document text
    • http://premiumpornclips.com/277568686222y4wc.pdfIn PDF document text
    • http://opensalle.xyz/what_is_active_listening_in_musiczj2tm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5fdbdf52079b3.pdfIn PDF document text
    • http://kegumexiwekot.22web.org/valid_email_address_format_gmail.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465941/normal_600416b3b1af7.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/dedigaginaxexokatew.pdfIn PDF document text
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/nosunupopiwise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gabigirinekib.rf.gd/veduzelevugepoxoxu.pdfIn PDF document text
    • http://xidatozekef.epizy.com/android_room_order_by.pdfIn PDF document text
    • http://gorosojipi.rf.gd/vuriz.pdfIn PDF document text
    • http://gesasodalunaka.epizy.com/11th_standard_online_application_form.pdfIn PDF document text
    • http://lirepotinemos.rf.gd/vaxid.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_off00014ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF7 5324 bytes
SHA-256: 13bd01ee3f492c2ab15e9ca7560ef35adba03b20321cd0e60e2f945c19189418
font_01_sfnt_off00016139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16139 10820 bytes
SHA-256: f1751738164966e0eee69bc25e4518871f425a5e4635d32875402946b61f1933

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