Malicious PDF — malware analysis report

Static analysis result for SHA-256 404cee3a5978e81a…

MALICIOUS

PDF

71.6 KB Created: 2021-04-15 23:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 162a4eb7ab83c9bbddeb3399c0238e34 SHA-1: 4e96d92764178667329a70c982f3bc2d74c7eea3 SHA-256: 404cee3a5978e81ab486c4ee2ffe936097eb7c376d0378b38638d14b340ca000
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. The PDF contains numerous external URIs, with one particularly suspicious URL pointing to a disposable hosting domain, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=doctor+of+philosophy+in+education+abbreviation
    • http://jakazobik.iblogger.org/88073004857.pdf
    • https://cdn-cms.f-static.net/uploads/4505125/normal_602d77e025f67.pdf
    • https://cdn-cms.f-static.net/uploads/4454300/normal_60221c35a9919.pdf
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fc59b77a9810.pdf
    • http://kisiguvawatabom.22web.org/trading_card_game_template_maker.pdf
    • https://cdn-cms.f-static.net/uploads/4451750/normal_60336e569ea23.pdf
    • https://cdn-cms.f-static.net/uploads/4407069/normal_60446f9b78104.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://modurogodolu.epizy.com/vemupapokiru.pdf
    • http://pebuvow.rf.gd/20512024279.pdf
    • https://uploads.strikinglycdn.com/files/e77de087-727a-456f-888d-96cbf3083765/mijajo.pdf
    • http://bibarixe.epizy.com/chess_game_mac.pdf
    • http://saninov.epizy.com/abusada_song_mp4.pdf
    • http://niziwumi.rf.gd/podux.pdf
    • https://uploads.strikinglycdn.com/files/f4815ee8-1757-4be4-8a79-136ede91be52/organizational_behavior_18th_edition_robbins_and_judge.pdf
    • http://wuzaxazogomag.epizy.com/20090632940.pdf
    • http://tibugesifavetel.epizy.com/about_time_book_richard_curtis.pdf
    • https://uploads.strikinglycdn.com/files/d4ed048e-9e7c-4021-b096-8de021a01d9e/1626091641.pdf
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_f7699db959064b76848dacf3269e15da.pdf?index=true
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_813421bef95d4e1da363733e7eed664a.pdf?index=true
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_b7186a0100294568a1e92d2fb528da5f.pdf?index=true
    • https://9505ca4c-dfdc-4941-8fde-ded35496d0c9.filesusr.com/ugd/2097ab_caa9566cd3ef4700a8deb2dec84b48f6.pdf?index=true
    • http://gefegasoro.epizy.com/dixuso.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_off0000d892.bin
ec7d0b4718ed7b50ae3f395510bc16685b66efc9f4de20f7f7d3b8f2a313ed2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 5544 bytes
font_01_sfnt_off0000eb79.bin
5a2db9f0d9a4479865e9d16dc19a3e64e0620ca19456142550289cd2b37d83ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 10816 bytes

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