Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b22216812e0d13…

MALICIOUS

PDF

105.4 KB Created: 2021-03-22 12:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ece7670f073c0c68f7a6597dab107950 SHA-1: 20e7b8ee492bf59bb4bc735338dbef8cb0096e0e SHA-256: f3b22216812e0d13c77565f74331d3a756a5fe93f79feb2ec00807134edb3fe8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to disposable domains, suggesting a link farm used for phishing or malware distribution. The embedded content, though heavily obfuscated, likely serves to obscure the true purpose of these links.

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://soxebez.ru/strik?utm_term=what+is+the+difference+between+jefferson+starship+and+starship PDF link annotation
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/farozibolidu_riroratodug_selid_rujodipazobasid.pdfIn PDF document text
    • http://makedctl.site/gamifuromeronjiyq.pdfIn PDF document text
    • http://pozebesibi.22web.org/boleto_santander.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/bURUge7/fun_literacy_games_online.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/paxogodotiforeb.pdfIn PDF document text
    • http://kitigaw.22web.org/cinema_hd_apk_uptodown.pdfIn PDF document text
    • https://gipavenox.weebly.com/uploads/1/3/5/9/135966662/9094638.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/8823848.pdfIn PDF document text
    • http://tameeniraq.com/social_media_management_platforms_for_business8f8rl.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/functional_cv_sample.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/how_to_reset_gosund_outlet.pdfIn PDF document text
    • http://subbellassecret.com/line_6_pod_hd_pro_x_vs_axe_fx26g7i.pdfIn PDF document text
    • https://cdn.sqhk.co/terupilenu/cDI85UT/41817812088.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefoveniri/igijggI/19743323849.pdfIn PDF document text
    • http://jogegeve.22web.org/winivusanevop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_ec8d59b4491a4639bfb2696a78e9ac37.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_720e8a03b7a94b6381772ecd0d840af0.pdf?index=trueIn PDF document text
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_f6efc295a91b4f9cb1d461c59b9456ae.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_a4e255db8f204e0eb3d13a5e505df6da.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_abb76db73960433990cda6de26a1c955.pdf?index=trueIn PDF document text
    • http://nezatexefig.epizy.com/gijebajanuge.pdfIn PDF document text
    • http://vebadivikini.rf.gd/acute_appendicitis_pathophysiology.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_off00015aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA1 5532 bytes
SHA-256: de6666370faeea4e28a5ea96eb27fc64e74460c3820f55e99f521a3005a7684f
font_01_sfnt_off00016d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D84 12908 bytes
SHA-256: 0c9628cd2425ffe6dcb99cc9ec1682b5bbc350419490253d1d4da264f89d6cb4