Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc6e0c2db174782…

MALICIOUS

PDF

75.2 KB Created: 2021-04-02 07:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d9b3d366be2c225d65114e61ad39977b SHA-1: 92ac75a188c2d81a72270126084fdc395236efd0 SHA-256: dbc6e0c2db174782315d78aacc4465c580f6ba9ed58ef4ba8cc76096a9071650
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains or used in a link farm configuration, indicating a likely SEO manipulation or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/wix?keyword=leeds+city+schools+board+of+education PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473963/normal_5fe78f323d103.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/trigger_de_schmitt_cours.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/fEiaHgg/aliens_vs_humans_flash_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/jJ4v5gD/22735207633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fd1b930a9481.pdfIn PDF document text
    • http://samemere.mygamesonline.org/55214465803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_6011524ca7ef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_605fb40e38bc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_60353a9456e8e.pdfIn PDF document text
    • https://cdn.sqhk.co/vonitumefide/qihYUid/doot_meme_doom.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/gchaMjf/street_basketball_games_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_383d600dbeb646c0961537572db9c519.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/how_to_repair_a_leaking_waste_pipe.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/all_christmas_song_lyrics.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_442d021fabad4a0ea5c5614709e8bb62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/record_date_and_ex_dividend_date_india.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_870b620178e04a39ae737de41e5556bf.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_83e933ab3ce64f9686e0a1032794ae50.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_24b2df06962c49f191d29fa304c52498.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_68e848a229fb44e3a6cefb0fe107b6af.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_2b00f0e5a0e84eaa97f5e02214955bcb.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_6eb940488dc0427ebae519db46b8c73d.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 5292 bytes
SHA-256: 521b1b130d3b2c89188ac8d722caf133da3286ed8513811f4798cb74256b7987
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 10832 bytes
SHA-256: 2363175757ecbbeada07b5b887ac867df4f94dfe4f5b5a74327a864c2038762d