Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8ea40f8cc6c224…

MALICIOUS

PDF

85.1 KB Created: 2020-11-24 01:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 50481ce8d128e7fd185efbe301544cf3 SHA-1: bee9f7753ed6ae58a47b6850a760e9e7246f6d60 SHA-256: ef8ea40f8cc6c2247e1d01ff9540b943fd79f6c3b1634a2955dc5c2a60984bb0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, suggesting it functions as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=warframe+a+horrible+place In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5f990d6867019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_5fa8c0449dc16.pdfIn PDF document text
    • https://mapizijef.weebly.com/uploads/1/3/4/4/134493838/0afb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8f23c25e9cb.pdfIn PDF document text
    • https://wudizibi.weebly.com/uploads/1/3/4/4/134477582/supudipuveba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fa7318690c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f9cdc93c2d16.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
    • https://s3.amazonaws.com/wixanarer/xazamorezasujofikanozuwen.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/suvagidojivuzegufudumo.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/laboratory_report_6_epithelial_tissues_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/47753671014.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/hannibal_high_school_mary_poppins.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/78171113031.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
    • 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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 4832 bytes
SHA-256: 0781309d543b5d4c40e49b2e095178274ac8376f67aa46ac96c30153d7bd59e8
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 10416 bytes
SHA-256: aee999a5d39760c8cea4f4fec546fdfab79373c9e84cfd6eeb5f96cde9b13636
font_02_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 16444 bytes
SHA-256: 4af1bd8690add4b57460e959b807a450a98e56b3180e4c0be4c3ba445649f329
font_03_sfnt_off000138bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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