Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f7390832658958…

MALICIOUS

PDF

86.3 KB Created: 2021-04-26 18:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 67af923bd0001f237475a7aa6706d2b6 SHA-1: 82144a325b1488277c14764764c78fc7460834e9 SHA-256: 40f73908326589580351fc8221eb81dad13f3223a234da887b683a21b1465d83
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=cub+cadet+ltx+1042+kw+oil+change PDF link annotation
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/7736529.pdfIn PDF document text
    • https://cdn.sqhk.co/kototokim/iOxh1of/avast_premier_offline_free.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/gitul.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/4JcjcNY/orchestrale_nota_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/u2Wiems/buzuwazebutufevaxe.pdfIn PDF document text
    • http://maroron.22web.org/construction_project_management_jobs_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/ijghGjb/tamil_christian_songs_3gp_video.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/VhOhjgm/foridelimijidalozimexu.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/svjgzid/oscar_the_grouch_onesie_baby.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/8759807.pdfIn PDF document text
    • https://siluxukazikuwo.weebly.com/uploads/1/3/5/3/135326211/dutigituzemebu.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/ZjhE0jd/aq_first_contact_mod_apk.pdfIn PDF document text
    • https://riwobasafogad.weebly.com/uploads/1/3/3/9/133999818/c01337.pdfIn PDF document text
    • https://cdn.sqhk.co/jisujesox/hiJaCja/bosch_serie_4_manual_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_cfcddab1115b428e88eb7fd588338e9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/18547312053.pdfIn PDF document text
    • http://nozoxujurasota.epizy.com/movie_creator_free_video_editor_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/84915080448.pdfIn PDF document text
    • http://vofegut.epizy.com/pagafi.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/bt_home_hub_5_slow_speed.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/broken_angel_english_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/20931692260.pdfIn PDF document text
    • http://mudivakerimenog.epizy.com/the_colbert_report_jon_batiste.pdfIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_efacbd7575954df3b6093fd5e2bd2391.pdf?index=trueIn 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_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 5608 bytes
SHA-256: e4c25327d3dd4a9724386c237ca28504eca727904960eb1c2a1d0abf78c8e9be
font_01_sfnt_off000123bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 11208 bytes
SHA-256: 819df47cf5458a65275a0ad1f56fe9524c957517aed81c2ca728da2eb565408a