Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dc34fe20a81a97…

MALICIOUS

PDF

74.7 KB Created: 2021-03-16 09:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e9e031d0a66229b0b8288c94e155295 SHA-1: 2ad4c8138ca47ac15e7b16c32e4efbdfff41d377 SHA-256: 92dc34fe20a81a9752cec24ed80f6ea0b8c8b2a22ab671cd4b039a51432d6e74
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=song+of+solomon+toni+morrison+audiobook+free+download
    • http://fringigejy.site/ticket_template_microsoft_wordwqff5.pdf
    • https://cdn.sqhk.co/zowonefaso/ajWhcCX/cowboy_hat_clipart_pink.pdf
    • https://ruloxewetufo.weebly.com/uploads/1/3/1/1/131164393/e5a3104430081.pdf
    • https://xavabijikuz.weebly.com/uploads/1/3/1/6/131636819/3124006.pdf
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/f5efe2.pdf
    • https://taboloralo.weebly.com/uploads/1/3/2/7/132741194/6c3a47b181d8642.pdf
    • https://cdn.sqhk.co/banuluwopote/8QjhPhh/mabatezifujuleluk.pdf
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/garinimifedumapo.pdf
    • https://cdn.sqhk.co/rasidepad/fMjj4r3/20615370176.pdf
    • https://rakumimow.weebly.com/uploads/1/3/5/9/135957304/suxuvudulirimapezip.pdf
    • http://filanion.online/romanesk_mimari_zelliklerixk8js.pdf
    • https://jiludagurifo.weebly.com/uploads/1/3/4/3/134349737/pusuje.pdf
    • http://prostosite.site/44311693908jbkfn.pdf
    • https://lezexoxutipeb.weebly.com/uploads/1/3/4/4/134462335/624a20f21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jirizaxewusi.epizy.com/bluestone_alley_music_sheet.pdf
    • https://s3.amazonaws.com/vabedafozo/hid_access_control_software.pdf
    • https://s3.amazonaws.com/falevi/juvomasepajaxobolefutotu.pdf
    • https://s3.amazonaws.com/bogeguva/pinutodojid.pdf
    • http://zulojazivuvuk.epizy.com/xusome.pdf
    • https://s3.amazonaws.com/woxorojero/apache_tomcat_7_free_exe_file.pdf
    • http://welemup.rf.gd/area_of_figures_worksheet.pdf
    • https://s3.amazonaws.com/sesafefanulokam/linksys_wrt120n_wireless_configuration.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40e.bin
223e1b9fd101a0b9f928319d461bee418cb85f4b1cbead80a52d56df99a66633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 5624 bytes
font_01_sfnt_off0000f72d.bin
5c29210804081ba5b6d5eda93e6fd38ef530444fd5690eb33e0729981c8f1441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 10692 bytes

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