Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d21e87603374fde…

MALICIOUS

PDF

75.7 KB Created: 2020-11-25 03:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 20299165d450027b4e15797cf908ff7f SHA-1: b018ba922d9584e572409f82fed9a766ea88f922 SHA-256: 3d21e87603374fde3479941f7fd2c5729ddf14ddb4a66092a7b4d1a205a68a31
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded links. Several of these links point to known malicious redirectors and link farms, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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=analytical+questions+and+answers+pdf In PDF document text
    • https://vetidemilutuzu.weebly.com/uploads/1/3/4/4/134492936/2130060.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/wosod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5fb6e16fa6412.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/gofozuvekatuwuda.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/af3cc1cf-fc19-4788-941f-2b9d072e2a62/logan_pelicula_completa_en_espaol_latino_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09965d44-b5e1-4532-a1c0-d8115287d9e9/highest_gas_prices_in_death_valley_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca659291-9c95-43c3-a6f5-35924fe4a6b1/xufolasow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95ae194-9455-4a82-995f-11abd3c9ad51/cbc_histria_ensino_mdio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f82a059-395b-4182-8eb6-39c6f61c8721/11325021709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c914d57-defd-44bb-8eda-8f85567dcf46/nejuwuzebijoz.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 5456 bytes
SHA-256: 1c69afe03ee66c8fb7196b47429834ad20d5e8cd94ceaedf22f77aa8dbd72fa5
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 11048 bytes
SHA-256: 481c8c89e6dc6a7ef2b3db6cfe31d3c259393a99890eec35d49c7dc989479dab

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