Malicious PDF — malware analysis report

Static analysis result for SHA-256 421b6f0cf59e9f09…

MALICIOUS

PDF

71.4 KB Created: 2021-02-14 04:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d28d34aa1dce2c26c8c21f5ec2c5faa3 SHA-1: 96c99e998aca885214a5a09d9ff2de7855776a20 SHA-256: 421b6f0cf59e9f09342e5a14bd0b30f85c11d705f4ad08783ab4444611094c64
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm designed to redirect users to malicious infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://yafferge.ru/wb?keyword=apple%20park%20guided%20tours In PDF document text
    • http://podcard2020.site/c_form_check_haryanabnydw.pdfIn PDF document text
    • http://luminar2-download.xyz/avakin_life_hack_apk_unlimited_moneydjs4q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506200/normal_5fe5a62852abd.pdfIn PDF document text
    • http://animoney.xyz/95012642383ebbgl.pdfIn PDF document text
    • https://cdn.sqhk.co/bamewimoxatu/5vvRHxw/34574568486.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/vaieHgi/aarp_insurance_phone_number.pdfIn PDF document text
    • https://pazarufawituxib.weebly.com/uploads/1/3/4/0/134000032/dasaduluzape_jusumajexi_lufazedaber.pdfIn PDF document text
    • http://ziratonis.iblogger.org/ragnarok_eternal_love_m_priest_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/dD8x19s/xumafuzekebej.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/cf35ed24914d860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wazododasexixak.rf.gd/busbar_design_calculation.pdfIn PDF document text
    • http://kutijizon.epizy.com/lagu_bunga_citra_lestari_kuasamu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 5180 bytes
SHA-256: 981c52ec6a625cd5bbe363e7860fefca8a1d0d3ec866a6852851c1fc7a3d6861
font_01_sfnt_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 2116 bytes
SHA-256: 991f7ef292b59849fa1804c361c52a6255426db797fbcab3b5d31d1f34ee76c9
font_02_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 11872 bytes
SHA-256: 528b47ed3a0edb8bae27474225fb209a0ef3d939a50ae29afc0d6046c3282af8

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