Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00c5f83a4bdc8df…

MALICIOUS

PDF

79.5 KB Created: 2020-11-30 20:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 32a93c51a160f3098aea688d655ba9bb SHA-1: 6489704ea50e0d45d4a962ba2dae2e00c4335091 SHA-256: e00c5f83a4bdc8df2c8cdd6daf524af32074edd4ebde995f52b55a5d02d66c54
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'cctraff.ru', are highly suspicious and likely serve as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://cctraff.ru/strik?utm_term=social+constructivist+theory+in+the+classroom In PDF document text
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/2970fb.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/jawemepuwiwifisuluf.pdfIn PDF document text
    • https://dukitupa.weebly.com/uploads/1/3/4/3/134393571/85ce5aacb4dc8b7.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.pdfIn PDF document text
    • https://zemonawajut.weebly.com/uploads/1/3/4/6/134688337/mulutitixin.pdfIn PDF document text
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/5850595.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/8fc0c952-f411-48d3-b4e6-ddf3ba671817/marvel_strike_force_fear_the_darknes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8730a7f-9722-47ef-8704-e00da265860b/aptoide_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/lake_lynn_raleigh_north_carolina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96f1064-daa4-4bc3-8e10-7ec865a594d3/34815939606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58dbd496-8e8f-4d95-abc4-d2b17933f41f/identificador_de_tipografia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e58a49f-51d2-4be3-b7f8-61a080e6bf2d/43876625231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc47cac-514c-46a9-af97-e72fe8e4301f/77980399567.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_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 5304 bytes
SHA-256: 0ca216e8a0c4af981255666d474f2063bd9da46a123f889c2628e3c2b3340a1b
font_01_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 11012 bytes
SHA-256: 0b6a43cd29409ab514e8f62156fa2bc80135e64109b3d5b5b2cb54b440898d54

Open this report in the interactive analyzer, or submit your own file for analysis.