Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a20a109bb91e3c…

MALICIOUS

PDF

87.6 KB Created: 2021-02-21 16:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a0d32708aa5757d399fa2bfeedd720ab SHA-1: 29e6731665345c2cf6b1401c6c649c7fda1926d1 SHA-256: 55a20a109bb91e3ce4c190c112de15b09cf3215449f741ed63ad492a4566f486
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or phishing attempt designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external URLs indicates a likely attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=what+qualifications+do+i+need+to+be+a+vet+assistant+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5fd600d89e752.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/rhepic7/76649082277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405186/normal_5fc8964d526ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_60324af268312.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/fZjigjp/66777407941.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/eBjhthh/endless_falling_lights_piano_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_5fceb6b2b558a.pdfIn PDF document text
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/gunudexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383565/normal_5fc7e0d26e61e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_601d5365dc323.pdfIn PDF document text
    • https://xakolino.weebly.com/uploads/1/3/1/4/131453712/gaxesetuxomoka.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/ad3tkeH/stickman_fight_battle_mod_apk_1._0._200.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/d9jaWgh/31179165145.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/igPgfU9/tevibesobabexozinu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_60051f987d559.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/hdbUiiC/piano_notes_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/prhdjc8/defigixakibupunirizuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 5300 bytes
SHA-256: a31a8a3668ad756fc4dd611909bd06bfb971ce33a41a70c39e20ff52ff8e51b9
font_01_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 11204 bytes
SHA-256: 39de388195bfd5b7833973d060b1e1248a551d8f6b49474f6818a00227602802
font_02_sfnt_off00012dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 16060 bytes
SHA-256: 3a2bb6651a5ad642813d1e324805fe83a688734d44fd23e014c0665a2602df32
font_03_sfnt_off00014242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14242 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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