Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a54620e7fc77487…

MALICIOUS

PDF

66.5 KB Created: 2020-12-25 17:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8f32097ccfc7363910011a7a78c030d9 SHA-1: 4569218527e8626e4e254fd9447578a184e0fd22 SHA-256: 8a54620e7fc774879bd9c2cef11235777b06750c751fe7ffb692006e6a25ac28
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 multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate it's a malicious redirector and part of a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=electronic+music+production+course+online+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fcd79d4cc217.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/CjhidgS/balloon_tower_defense_4_learn4good.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/97e40f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fa4e63ec89b4.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/vizegemawokaxe/kufebokifelujigujesorowot.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/99271021151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7215b05-cf72-46b2-8901-0bd269647b9f/rstudio_shiny_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/cv_format_for_sales_executive.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/hand_car_wash_business_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22bb094-15ae-44ae-ba8c-dad4dc85aa9a/mac_os_x_v10.6_snow_leopard_download.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_off0000c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 5048 bytes
SHA-256: 3aa58b5c860c04f748c13691011dfa030dc59a5daef72ec7ed6f2a5ffe379394
font_01_sfnt_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 11016 bytes
SHA-256: 087cd4adb59d6bec14a8b3f4190339e6798b7abb141ce4393e2c8418b3dca3d7

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