Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda69b3eab4b36b0…

MALICIOUS

PDF

68.0 KB Created: 2020-12-27 11:30:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: af2f0bb835dd1e403bd9f96d55686481 SHA-1: 72674a9fb3ee43781e15d13c04324fcd734f534f SHA-256: cda69b3eab4b36b0f4757951072395da28856e641d009126820fa215724bde0d
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The document body, though heavily obfuscated, suggests a lure related to a 'Flames game app'. The presence of numerous external links indicates an attempt to direct the user to potentially malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://cctraff.ru/aws?utm_term=flames+game+app In PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/lufakitire.pdfIn PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/jinebuduposeva-dazosizi-zodapoja-lifewosatul.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/2164756.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/UhcwJOv/ufo_enemy_unknown_wikia.pdfIn PDF document text
    • https://valaxekujabe.weebly.com/uploads/1/3/4/6/134653377/826fc.pdfIn PDF document text
    • https://jezafemobad.weebly.com/uploads/1/3/1/3/131383748/c31603.pdfIn PDF document text
    • https://lisamotakix.weebly.com/uploads/1/3/4/3/134308999/gipexajedaveju_dukotufafejeji.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/lululobos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a054d1d-3016-4366-8501-3af1b4a1978c/mastering_biology_photosynthesis_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06d32a4-8084-41ec-a272-e87322e06147/rejabupolotabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7921328d-6b27-4056-96e3-a6f763524808/22708646329.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/20473771838.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_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 5000 bytes
SHA-256: a8c2ebaab40034e28159393e9c19c09bc637bdca1c68f97c3fb234bd97bc8e78
font_01_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 10976 bytes
SHA-256: 49264c47d3f9e185962665225b7c6fc73fed897f79a14d504a41664edb56554c

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