Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa9e569e631e39a…

MALICIOUS

PDF

78.0 KB Created: 2021-04-13 05:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9277694039c15863ae0c463e1ccae762 SHA-1: 24dafa070515b3cd4cb73ae168c46a8c87c3da2a SHA-256: 7fa9e569e631e39a0a6ed2ac9bf453ebf47585c38428797460ee08b2ceb27216
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a technical document and lure users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jumiwimov.ru/strik?utm_term=abstract+factory+design+pattern+in+java+with+realtime+example PDF link annotation
    • http://kotebebe.iblogger.org/gujojozu.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/856a71.pdfIn PDF document text
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/botukovu.pdfIn PDF document text
    • https://zurirepazigotot.weebly.com/uploads/1/3/0/9/130969164/rabomafepux.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/nudavewojorovow.pdfIn PDF document text
    • https://gebifulud.weebly.com/uploads/1/3/0/7/130775692/f9832dee.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/gigixagajufibates.pdfIn PDF document text
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/pijidunase_pozutufepupalew_xokatokibime_kufos.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/vefomojozuzasev-vekapi.pdfIn PDF document text
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/jojovedubumuvi-melevezapewu-radanuneraxu-pagazemasazobil.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/wupolitaburopo_guzexomoxi_xerimujeta_vizinonovitusu.pdfIn PDF document text
    • https://bibonuben.weebly.com/uploads/1/3/4/5/134576194/fixabukoganov-lakesudukisu-vobavor.pdfIn PDF document text
    • https://rosowimibezot.weebly.com/uploads/1/3/5/3/135392622/5724184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujejuxuj.rf.gd/ulcerative_colitis_pathophysiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5bb071-0870-4bf2-9b28-be99c6947c63/what_are_iata_codes_used_for.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/ziponajiwuvimi.pdfIn PDF document text
    • http://daporanil.epizy.com/41249680338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3098e82-98ce-48ad-b451-435561a52ef4/71015936742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5027cca3-2bd1-4336-86ef-7c1de380c0b9/calories_in_dunkin_caramel_iced_coffee_with_almond_milk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128cc4c9-ff9f-4016-8fba-665efd7614a1/zurofomus.pdfIn PDF document text
    • http://kipenul.epizy.com/96282079663.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_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 6096 bytes
SHA-256: 4aed0b988fd3e99320d6e094f8e6485939be25241d37521fb24cb6d8e05497d2
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 10580 bytes
SHA-256: a0a78d82821b23e6a6e4ddc74f880e95adad889055b9156291d3f23c8dcdc065