PDF malware analysis — malicious · dbad6ebdb25bf1c2

MALICIOUS

PDF

77.1 KB Created: 2020-11-30 20:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04

MD5: 3a11d8075f35a6d8120cc8619abdcf43 SHA-1: 0ed8f982b809d117142bbe82317a6e55bdfed767 SHA-256: dbad6ebdb25bf1c24a81d2d0920872a4a16c14f3b3ecd1cfc8c720a83aab8e18

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9661

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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`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`

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