Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f24d90dce15756…

MALICIOUS

PDF

71.2 KB Created: 2021-02-21 21:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: db77cbaa22d51e779049a47b8ad86aef SHA-1: d8ff6d6359b8355088908a8a64beadd277ae197e SHA-256: f8f24d90dce1575696e86c9b893d0ac7fd449f84ce6f605306807943aaec6fb1
126 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 numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector. The presence of external URIs further supports the attack pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wb?keyword=meriam%20and%20kraige%20engineering%20mechanics%20statics%209th%20edition PDF link annotation
    • http://swiss-gear-top.xyz/dell_poweredge_r710_server_datasheetxwpmb.pdfIn PDF document text
    • http://cashtanks.fun/75838147442a91xv.pdfIn PDF document text
    • http://naguvogegexaze.22web.org/eeg_report_means.pdfIn PDF document text
    • http://bisipatelaloguj.66ghz.com/84357432617.pdfIn PDF document text
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/d6504623e.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/jaiegca/gsmarena_compare_iphone_12_pro_max.pdfIn PDF document text
    • https://wotopegajoxife.weebly.com/uploads/1/3/4/0/134042499/34f4cdf5baf.pdfIn PDF document text
    • https://cdn.sqhk.co/dewobube/fGDjgjb/gafifuwesojipidix.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/dkibmhg/cute_cat_pictures_hd_wallpaper_download.pdfIn PDF document text
    • http://xakuneferufilew.iblogger.org/3137277398.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/rudipemawowilujovo.pdfIn PDF document text
    • https://tefafovok.weebly.com/uploads/1/3/4/5/134588422/c025d34930.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/dijemavegorepalikufi.pdfIn PDF document text
    • http://sosunimepewe.22web.org/fundamentals_of_discrete_structures_2nd_edition_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/d7RhOph/zombie_dog_modern_warfare.pdfIn PDF document text
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/6a2c3a6bdcc781.pdfIn PDF document text
    • http://verenewesukifed.22web.org/13821367586.pdfIn PDF document text
    • http://nat-yoga.space/introduction_to_genetics_lecture_notesh2hlt.pdfIn PDF document text
    • https://bebedukiraf.weebly.com/uploads/1/3/4/8/134885496/7b34c03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sedejavuguz.rf.gd/balance_game_ocean_of_games.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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 5548 bytes
SHA-256: c4730316c99f55b1844d798805b25d9b0e99121e594326bbf19b6b4681849b66
font_01_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 10632 bytes
SHA-256: ca2144e4dd3fc5e7f19edd988e2880a2f39316a66cf0c9ffa3112c2a9d89c298

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