Malicious PDF — malware analysis report

Static analysis result for SHA-256 526a8b636a6da2e6…

MALICIOUS

PDF

76.5 KB Created: 2021-01-09 17:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 65245102d9ae562afb8325ecd8c496fc SHA-1: 469a925b86acf63f523b5074801f616177d590f3 SHA-256: 526a8b636a6da2e6e019cb015d7561925b80b34a9a9b8db4dd63c22153baeaf4
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to link farms designed to obscure malicious destinations. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/aws?utm_term=behringer+xr18+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5f90d64186be8.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/VuFI4ET/retro_football_flip_flops.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/ahdXgi6/strategy_pattern_c.pdfIn PDF document text
    • https://cdn.sqhk.co/midipumep/jhHyjbJ/short_video_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fd64a20a2a2a.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/zirozefodem-favamutejize-damajaniv.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/pLaSgg6/falling_puzzle_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jerfXjh/jilividunubile.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/2486964.pdfIn PDF document text
    • https://loxazofobel.weebly.com/uploads/1/3/4/2/134265844/9767922.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/eZAidih/aquarium_rope_puzzle_last_of_us_2.pdfIn PDF document text
    • https://xuvamifete.weebly.com/uploads/1/3/0/8/130874567/4648050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 5640 bytes
SHA-256: 6760b646e91aa9169548791bc952ab1c117349d939493d1e89b7df28c0bc2211
font_01_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 10704 bytes
SHA-256: b17fce181b446d62d8095cbd738fdc0622e087bb6fc69b10673e4a85b5ba6664

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