Malicious PDF — malware analysis report

Static analysis result for SHA-256 674477f42ef6ed6f…

MALICIOUS

PDF

71.8 KB Created: 2021-03-27 17:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4442b2fe65d4654a3b0fc7e2ef344779 SHA-1: c9e217d4f044aff6ca412435af1f6203a5a17145 SHA-256: 674477f42ef6ed6f1deff86c760bb8d63e8737f08d5e70fd02265c18b443791a
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 hosting, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=java+programming+interviews+exposed+pdf+download PDF link annotation
    • https://cdn.sqhk.co/nepajenine/hZhiGjg/musica_italiana_romantica_anni_70.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/Au4jgM4/adobe_photoshop_fix_app_android.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/does_aldi_sell_gluten_free_food.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/best_short_term_stocks_to_invest_in_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/dhPgiie/66930719788.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/how_to_setup_d-link_dir-615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_1493d66636434fd4b5484530986025e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bf4fa8-f206-4d46-8d1f-294711d042c2/paggawa_ng_booklet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b15cc6-4f40-474b-a5ad-d837f8f6e562/mowunefekelozoxo.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/69547124486.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_e0811d6811cc4253ac57cfaa1e58942e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77187e56-8943-49e4-961f-69b532c64264/kuzed.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_6f00a64f87db4b2aad8713b76b3a75c0.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_d165071d667a421483aac8aa90f9b045.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21420d5e-712c-4396-bcb0-55cc6266269f/15323009767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3f5a47-3e12-4db2-b3f5-4298fd2b5557/36442880713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fd648f-8e2b-4ad2-bfef-826541b5876e/how_much_are_iphone_7_screen_repairs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4eedcb-ac94-4711-b683-788c3b719973/how_to_find_the_value_of_normal_force.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cfffc46-8865-403b-abe5-20d73f9b6a7e/35897952310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a397a9e1-ab0f-4827-93bf-6bf46d37bf2f/wixadurebeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb564089-6470-483f-8730-f4043a31976a/48903912809.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 5572 bytes
SHA-256: 34251e77fe84f38c8bc364ee35bb70a6a7b50b9c3c7ce30e6309004feead0f9a
font_01_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 10400 bytes
SHA-256: 802ee99ca3622a6da726b8f6458b54f062cec5321baea3e22bf797b5b85e7002