Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a57c792addfcbb…

MALICIOUS

PDF

102.9 KB Created: 2021-05-09 08:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f5d6b7e028da6fdd0fbbeaac50c423a0 SHA-1: 582f45e3eb8d7f80eaf8a23bc0297bca919e217f SHA-256: b9a57c792addfcbbcc734b89e8357061fdc21612fa0430a96b5126298084eada
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 0.9972

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://kuzutuzo.ru/strik?utm_term=the+man+in+the+high+castle+trailer+italiano+stagione+1+episode+9 PDF link annotation
    • http://zuregazezoral.mygamesonline.org/michael_bazzell.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/hfQihup/nidefuvo.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/6716242.pdfIn PDF document text
    • http://zuxuvikewi.sportsontheweb.net/3307492321.pdfIn PDF document text
    • https://cdn.sqhk.co/raxulaxesob/gejihhU/84882209658.pdfIn PDF document text
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/8e3f5d0842d51a.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/83127038652.pdfIn PDF document text
    • https://rojikejasixut.weebly.com/uploads/1/3/2/6/132682083/tegoz-sudozinadi-luvixofozijuj-fogazuminolom.pdfIn PDF document text
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/tigobogix-gadejupifa-nararexubu-vetune.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/jxPhih6/71146555721.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/bukiteputetexobewujoru.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/ujdjdMH/36298381655.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/dffgeia/free_kick_dream_league_soccer_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/gcrvzii/gastrointestinal_arteriovenous_vascular_malformation_icd_10.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/7305072.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/hOF31ic/11970967584.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/78173181729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natukifuza.atwebpages.com/dogixo.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/what_is_western_philosophy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45df6548-11f6-4aa8-99d1-325dd053ab9b/ron_paulk_workbench_height.pdfIn PDF document text
    • http://desovizipelo.onlinewebshop.net/how_to_draw_born_haber_cycle.pdfIn PDF document text
    • http://xolevusafo.myartsonline.com/51348123827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a01b348-2405-4460-8e09-cb2cc526a641/9737116751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc0b01d-1774-4a28-9a8e-f79699ee3dee/where_can_i_get_kenmore_washer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8ee240-49e5-4c95-940c-0f7f0c5fba74/what_is_dynamic_equilibrium_why_is_it_called_dynamic.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F0 3352 bytes
SHA-256: ae66fc8067988c53644e3f92241e3e20fab0d284350021926dab8cc1dd5f2c92
font_01_sfnt_off00014cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF0 5644 bytes
SHA-256: ff572662b0b524ab8950b8c221aaabf952fcb749de2e6d08dda2c64ddad95961
font_02_sfnt_off00015ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF7 13224 bytes
SHA-256: 4b9d7303cf94abd9ff536523bdd4a30bc073a2c2dd1ec17ee928838b0f9e84e8