Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c7669026903d8b…

MALICIOUS

PDF

66.3 KB Created: 2020-12-01 17:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3add46bb41234fea7dd73316473e61e2 SHA-1: c131eceb8f96da4fdcf94b34e6796846515314c2 SHA-256: 55c7669026903d8b6bf9d1356c65ec1d22cedf5c85fe61cca9dee89cc2dacd34
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of numerous external links suggests a link farm or phishing attempt designed to direct users to harmful websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?utm_term=how+to+make+dodo+kibble+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5fc0bdd30eb7a.pdfIn PDF document text
    • https://zukiferadisuxa.weebly.com/uploads/1/3/4/7/134774344/govixafoxib.pdfIn PDF document text
    • https://venakadu.weebly.com/uploads/1/3/4/7/134729608/4ffe8b8a0c4d58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfcd6f403f5353fd8f68b6/t/5fc2dfde1972c46e3cfd744a/1606606815701/thing_explainer_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0028ac14dfd36feec75cc/t/5fc0d9b9e18c5c478e1bd67f/1606474169466/sizolejanuni.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b7932e34347c70431387/t/5fc14b5f4f983757200f6b2b/1606503264395/castrol_motorcycle_oil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf63b7f8cdb769c6dad28d/1606378423775/88319313684.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe2417e7202640eab110/t/5fc4d4aee6d49a06bb2a79ca/1606735023754/luxujutuwufibu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f58b2cf09257bd796827/t/5fc3ecdc3570fb44d17c1986/1606675677869/download_modern_combat_5_apk__data_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/57995214033.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/9199563732.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/94146196319.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bdc717e7202640e9644a/t/5fc0daf764571256545b7d87/1606474488283/sword_art_online_girls.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_off0000c5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 5436 bytes
SHA-256: c222e866e846c0a39fb40aef730367debfc5e53a6d9af9b36683fd0e459bfeb4
font_01_sfnt_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 10708 bytes
SHA-256: ee1cb5e007c7ddf1ae1a95ae2cebf2f508dc53773a2585a1d1586f417756332d

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