Malicious PDF — malware analysis report

Static analysis result for SHA-256 de24cf63c75890d7…

MALICIOUS

PDF

131.7 KB Created: 2021-03-29 05:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6ae9a8a7e5fefd4fb499c278ab3c469b SHA-1: 7f238fbd27a2ac81aed4a9cc6892aafbab7296a7 SHA-256: de24cf63c75890d70916e4720e0ac49815a151fc7f4e7b6e0d9de7ba654153a7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the 'link farm' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://bologen.ru/strik?utm_term=on+the+social+contract+rousseau PDF link annotation
    • http://daxamel.mywebcommunity.org/junapuruz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_6049edd349fd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fca84ffbac49.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/sitivoravagovuweja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_603a2246b65bf.pdfIn PDF document text
    • http://kebuwakuje.medianewsonline.com/advanced_vocabulary_worksheets.pdfIn PDF document text
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/bdb36c.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/movie_monster_problems.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/graco_glider_swing_cradle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_603d2c94d6be9.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/nezotokesebupunuko.pdfIn PDF document text
    • https://pudixibavumop.weebly.com/uploads/1/3/5/9/135964902/gesizezolumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b0735207-e2da-42ea-9877-576a249ade9f/lotus_carlton_for_sale_canada.pdfIn PDF document text
    • http://gefuwaw.atwebpages.com/is_percy_jackson_real_story.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/rabigelizuxidekimarodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde45518-ec6d-42d3-bcf6-4ae75a644cbc/51404632972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9dfba58-eab1-4139-9cd7-79f461ebedb8/how_to_grind_valve_seats_with_stones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f447b9c-2e07-484d-b264-f9f455d8f7aa/jekodorexawomar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB29 4796 bytes
SHA-256: b9f87ac86e2200f7b1ceaea52e35b0d4e581d5a86d4154b652749245ab46eacb
font_01_sfnt_off0001cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB6C 11928 bytes
SHA-256: db7e36d4c37b075677a14dfac331a549f274aa21d166d16e32386648c363cf7c
font_02_sfnt_off0001f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2F8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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