Malicious PDF — malware analysis report

Static analysis result for SHA-256 528fd05d17d5cfbb…

MALICIOUS

PDF

64.5 KB Created: 2020-11-18 22:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 10afc4b423309422a5da806a18928d19 SHA-1: 7ffe98921f28a14d6db8d0772b782b5ef74049ad SHA-256: 528fd05d17d5cfbb9e1adc89c786e8337b5865064847110638fdaab86b3a25f0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a mass of external links, identified as a link farm, pointing to various PDF documents, likely to distribute malware or conduct phishing. The heuristic PDF_SEO_LINK_FARM specifically highlights the presence of numerous external PDF links, suggesting a deceptive tactic to drive traffic to potentially harmful content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=door+harp+parts PDF link annotation
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/dakasoka_nezitojotobubij_kedifewav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_5fb32e4d59e31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f9a3608a9b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fb2af009827f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5fa2a95f3d1f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_5f96a196be061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_5f952dd3d1fef.pdfIn PDF document text
    • https://duvirimak.weebly.com/uploads/1/3/4/6/134603536/bexetekigudeguti.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/4fad2ed4-8916-44a6-9a66-290f03d0b286/pozzoli_guia_teorico_e_pratico_1_e_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/sword_art_online_ep_9_eng_dub.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_off0000c00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00D 4872 bytes
SHA-256: 5e19108782ee2e085b9483404ec610d1d04846def7a477ea8b972c2abbd6627d
font_01_sfnt_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 10908 bytes
SHA-256: 9c385cfba17e69cc93eb4f9aa28a902362bda6bcff45055a362b940e8edfae03