Malicious PDF — malware analysis report

Static analysis result for SHA-256 3899d7e3d9cf67ac…

MALICIOUS

PDF

75.9 KB Created: 2021-05-14 21:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e7bbf01c2846f0e27154c743979181f SHA-1: b31484b4959c6f6c24d0455b39fe2ab1fa5c1fbf SHA-256: 3899d7e3d9cf67ac15a125651376c5f7bb5298b33b62bc462a6fa4d8c6a3a6bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. It contains a large number of external links, suggesting a link farm or redirection mechanism to distribute malicious content. The embedded URLs point to various PDF files hosted on external services, likely intended to host phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=samsung+galaxy+note+4+original+battery+amazon
    • https://cdn.sqhk.co/fodexuxefeba/jVXigdl/phoenix_arcade_game_ios.pdf
    • https://mezamavizasiv.weebly.com/uploads/1/3/5/3/135312133/novibolevefixum.pdf
    • https://static.s123-cdn-static.com/uploads/4453550/normal_6006598d8247b.pdf
    • https://cdn-cms.f-static.net/uploads/4411480/normal_600f73893b50a.pdf
    • https://cdn.sqhk.co/gebemiwisero/Cs7gfhe/58633693329.pdf
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/bukegafunep-xarur-xedanalafa-lijupan.pdf
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/6892496.pdf
    • https://cdn.sqhk.co/jinubodilev/ivhbOie/jegevovokoteja.pdf
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/nevifemis-joladoz-gepubomoguwolad.pdf
    • https://static.s123-cdn-static.com/uploads/4454438/normal_6004fe12425a0.pdf
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/lifif.pdf
    • https://cdn-cms.f-static.net/uploads/4368999/normal_602add71df78a.pdf
    • https://static.s123-cdn-static.com/uploads/4371247/normal_5fca04635081c.pdf
    • https://cdn-cms.f-static.net/uploads/4373788/normal_603e9e2713675.pdf
    • https://cdn-cms.f-static.net/uploads/4465949/normal_6048fa022eb6f.pdf
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fe875960544d.pdf
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/watoxerefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d76f344-0a7a-4953-96e1-d7d2179f2f46/american_gods_book_list_of_gods.pdf
    • https://uploads.strikinglycdn.com/files/6867e439-6dec-463b-a29c-1eb499bdf630/great_love_story_book_series.pdf
    • https://uploads.strikinglycdn.com/files/ffc0ed17-26b9-480d-84de-c320b6042425/wojotumel.pdf
    • https://uploads.strikinglycdn.com/files/8d4673f0-0057-4165-8808-fc2bf9b828a0/wikazegosodixukufizip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9db.bin
2ff3f265f7ed8b35c16c87b4477b9ff3eca57d98aeec49968acb25f4b27892a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 5556 bytes
font_01_sfnt_off0000fcc3.bin
44cb22f706b41bb76862da16c5a8747f77f550b28a21d42f06a12238c7338872
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 10260 bytes