Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9c4b41053c1eb7…

MALICIOUS

PDF

64.8 KB Created: 2020-12-29 21:39:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 02d5650497a4b5f716e67fb4b82bab3f SHA-1: 9d0eaa55d5d6d561e37fcea1e2462d48a475c1b0 SHA-256: ec9c4b41053c1eb7161eb3a7cffcbf7761aad089028d5e3a1b240882e379760b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are part of a link farm designed to obscure the true destination. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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
  • 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://traffmen.ru/123?utm_term=transitive+and+intransitive+verbs+worksheet+with+answers In PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/44091844.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/giib6iy/spin_blade_battle_io_mod_apk_unlimited_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5fc44126f09b8.pdfIn PDF document text
    • https://bonawuxuje.weebly.com/uploads/1/3/0/7/130776103/00811d6b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8f708138b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5fa426f86c0ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5f8fb516efb61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5fe8100450ce4.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/9777178.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/gupuso/wikafo.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_off0000c26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26D 5184 bytes
SHA-256: dddea8fc8cbc96b0d191acb84cb40625606e10dc61d2eae6e80aca6fba10c9cc
font_01_sfnt_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 10020 bytes
SHA-256: 0a35966f960548cc18e02f9c4bc41e3ab640d21b90cf9da33cfb02959301e0ec

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