Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bd242bb7520d8a…

MALICIOUS

PDF

93.3 KB Created: 2021-02-15 16:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ceb00a9cd0a5225ae4bbd0fa1bf01053 SHA-1: 96362b5b45435ebb80dceb3011a6e23b0f371ba3 SHA-256: 16bd242bb7520d8a3a48473c4f122691e072b65803cc7c559798606a35357c30
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely using JavaScript for redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=harrison%20internal%20medicine%201st%20edition In PDF document text
    • http://smm-target.ru/boston_traffic_rush_hour_timesyuni4.pdfIn PDF document text
    • http://auto-agents.space/retevubotoxuwifiwatixunujqzq2.pdfIn PDF document text
    • http://bonboxstudio.com/31688735058lrf3j.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/ficibhb/14394914911.pdfIn PDF document text
    • https://cdn.sqhk.co/derubejes/ighjmCj/download_space_agency_2138_mod_apk.pdfIn PDF document text
    • http://tourist.fish/kivot0ct93.pdfIn PDF document text
    • http://discovljzg.fun/list_of_important_inventions_and_discoveriess45ol.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/69499613034ky0qv.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/uMja7jj/dollar_tree_plus_store_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/g4dXhRR/scary_clown_photo_pranksters.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxedanafowa/KIqShh4/91717114712.pdfIn PDF document text
    • https://cdn.sqhk.co/waketeni/flmcKl7/drive_games_hill_climb_racing_download.pdfIn PDF document text
    • http://store50off.info/universe_definition_earth_sciencef9x6n.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/xtJhhhe/catchmaster_insect_glue_traps.pdfIn PDF document text
    • http://cmb-societe.com/37168653103a9om5.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/jucAQjp/ice_cream_cake_sweet_icy_desserts_mod_apk.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/motorbike_sidecar_racingbra4j.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/FjiqgeS/25525737715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F58 5100 bytes
SHA-256: 6be39848a00a132517f3a6a1faa62b9407b98d7bb27d2b0122f490c55a137c3c
font_01_sfnt_off00014099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14099 11708 bytes
SHA-256: f958a9f180f99e86a2c4e3c1c2e4533be4e2b86ba1bf93d00cc0ef9442997b6d

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