Malicious PDF — malware analysis report

Static analysis result for SHA-256 1132775d93923b01…

MALICIOUS

PDF

86.4 KB Created: 2021-03-16 04:01:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 53189e1fa5eae5898c0813beb20a8a05 SHA-1: 5bf64ec6ff222617fb3c9027b65ca2b2a18c0d6b SHA-256: 1132775d93923b01c1320965147f4a8d6d153a8d09da234802a0d17508f37846
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the nature of the PDF suggests it's designed to lead users to malicious or deceptive content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/award?keyword=abecedario+frances+espa%25C3%25B1ol+pdf PDF link annotation
    • https://cdn.sqhk.co/nosuterib/harICjf/cookie_monster_race_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fematixub/gjGgeGR/free_hd_wallpapers_for_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/cjjifbH/change_the_voice_exercise_for_class_8.pdfIn PDF document text
    • http://idem-peshkom.ru/38154307740v5h4t.pdfIn PDF document text
    • http://citruss.space/woxamovok4lox.pdfIn PDF document text
    • https://tasukivokojut.weebly.com/uploads/1/3/4/5/134592673/gigeru_mubelarefo_zepusubemi_vevuzuviketa.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/2gfYjfT/communism_vs_socialism_definition.pdfIn PDF document text
    • https://sukutunog.weebly.com/uploads/1/3/5/3/135304197/luvajokuwumog.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/2nhgjcp/zunaresakupebavise.pdfIn PDF document text
    • http://lnstagramoriginal.com/send_text_messages_wifi_androidxll7q.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofebiziv/hibhgrx/kezuruza.pdfIn PDF document text
    • https://cdn.sqhk.co/kizajituxab/6bAhh2N/cabrio_washer_owners_manual.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/9d4eb2b4068.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/eQ36BA0/voziwu.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/da4AhcT/traffic_crash_investigation.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/4rMsjge/swingman_logo_nba.pdfIn PDF document text
    • http://raisinsapp.pro/66949037882pixpw.pdfIn PDF document text
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/kedidatim-wosafar-sopidar.pdfIn PDF document text
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/6834252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topajikof.epizy.com/examen_ser_bachiller_2018_resuelto.pdfIn PDF document text
    • http://ribuxuvotamu.rf.gd/10th_class_maths_book_ncert.pdfIn PDF document text
    • http://jofawapedoguw.rf.gd/20678138543.pdfIn PDF document text
    • http://kinifojuno.epizy.com/71972349685.pdfIn PDF document text
    • http://gutuxujerulobed.epizy.com/spanish_sentence_structure_worksheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 5492 bytes
SHA-256: 9d68c2ef88321aa1a8a70b7fb1efc98be233195b55edebd54c4f0a8996584f31
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 17492 bytes
SHA-256: 12f51eea11e404dd22b0659c80b03aecdad21b21f5dcb9e22191b6ff9ca22539
font_02_sfnt_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 16100 bytes
SHA-256: e5355abaff8fcab33ce34e55931ff21a393705a3507c9049660e5b960e5a87d8