Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e0eef2bfa87d23…

MALICIOUS

PDF

85.7 KB Created: 2021-02-27 02:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 533aefd378aa1d07db481f95a81eead8 SHA-1: abea440b6898f5ca2e9b812c1602a1f73c53912f SHA-256: d8e0eef2bfa87d23d464ed4b603cc1e3466c3d47c72b106706e3a558bf505e95
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, and a PDF_URI pointing to a suspicious URL. The ML classifier and ClamAV also flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=is+there+a+sequel+to+one+of+us+is+lying PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479942/normal_5fcea1be2eaba.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/8752246.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/aHidjeh/vomero_5_white.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/UhjSgg3/the_last_door_ps4_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/hajeuvN/5828239834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5feff72510c80.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/jmVNhg5/tv_games_namco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_5ff3418e93da4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pipaneku/87277707498.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/chain_guide_electric_bike.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/costing_sheet_d365.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/pedig.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/cs_energy_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/joe_cocker_feelin_alright_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/texevut.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_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 5192 bytes
SHA-256: 595bde1395deb2dff378f33fc7960f0b0c1bf4e77b528ab9daa6a5339c5331c3
font_01_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 10384 bytes
SHA-256: 8a3a4764f0e45a689eaf9898aef4c36767cd733c298da90a8162c263a2cf5bd0

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