Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af2e02790c3a297…

MALICIOUS

PDF

75.9 KB Created: 2021-06-02 02:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 77bc920c76a494afae3ee457bc45a4b1 SHA-1: 87b53a768ae27888924a0b82d25a95a47a0b4501 SHA-256: 9af2e02790c3a297c6c987abf8712c3999456167c53e0bdb121d7955ec5a36a6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/pbw?utm_term=how+to+fill+out+a+stock+ledger PDF link annotation
    • https://derebadinexito.weebly.com/uploads/1/3/4/0/134012579/pofadiletobuku.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/c834182b600552.pdfIn PDF document text
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/806c01af6fc.pdfIn PDF document text
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/ec8419c474a145a.pdfIn PDF document text
    • https://jawavovamote.weebly.com/uploads/1/3/4/7/134748122/5808233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumasenekera.pbworks.com/f/malerafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a8e7ec-e006-4d6d-b862-fb02e9925802/mefuded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b818716-3103-4a1e-8088-956282319175/paxadaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a92a96aa-75ce-42e5-81ca-3fb07b44431d/is_dunkin_donuts_open_christmas_day.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/can_you_download_pokemon_sword_and_shield_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95118553-dc5a-429e-b491-4e942f7b2549/sevowibedona.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/w/file/fetch/144458268/is_revolut_for_business_free.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144419517/wukotugemovifek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10a6826-1a90-4702-9606-6ded94e0d5ff/wowuwigofereje.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144425349/3ds_max_vray_material_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e24eda-c67c-4200-80c2-57f8088de6ff/sigusadedunodopijal.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144483438/texte_informatif_3e_cycle_primaire.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/transformers_movie_music_download.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/57364362601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bbf814-aa5d-4426-9f91-81426385ff53/80029558168.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/vewalofiwebori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d632f9-7f2f-4cfe-87a8-8504a44bff8f/is_there_a_disney_parade_on_tv_today.pdfIn PDF document text
    • http://neruwuk.pbworks.com/f/jemexew.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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5308 bytes
SHA-256: f945c1ddcde86bc979bd68dd344db717474c7dc63f3e5365da40996d2f343dcb
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 10156 bytes
SHA-256: 9499dc5d59c0f055d8fcfd83b6c198582325e899f9373015c485030060bd22eb