Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46becc4c1c5c7b4…

MALICIOUS

PDF

75.2 KB Created: 2021-05-08 20:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d38b0eeca97e862b4ce898e384e0a522 SHA-1: 15117f612da7764d7ab550b3718555de5a331f56 SHA-256: b46becc4c1c5c7b4ceb13711e7a69425ba5c9f30fbcf78139af5fd69d7398c5f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/strik?utm_term=how+to+use+crock+pot+express+air+fryer PDF link annotation
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/1735151.pdfIn PDF document text
    • http://timinome.getenjoyment.net/why_use_seasonal_produce.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/calendario_luglio_agosto_2020.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/infinix_note_7_price_in_ghana_now.pdfIn PDF document text
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/2662462.pdfIn PDF document text
    • http://haifaiv.ru/duralast_jump_starter_700_battery_replacement5qytq.pdfIn PDF document text
    • https://vifaniju.weebly.com/uploads/1/3/4/5/134507083/d2901d64600ae18.pdfIn PDF document text
    • http://wdd13.ru/71047618144p16ra.pdfIn PDF document text
    • http://idealica-co.site/pathfinder_adventure_card_game_rules9jext.pdfIn PDF document text
    • http://osthondroz.com/best_likes_for_instagram_freebclji.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/self_organization_and_associative_memory.pdfIn PDF document text
    • http://reduslim-ufficiale.website/how_to_echo_path_in_cmdr1elk.pdfIn PDF document text
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/134630561/d4e22.pdfIn PDF document text
    • http://mufinofol.scienceontheweb.net/xosodatodusopavanesapa.pdfIn macro / runtime command snippet
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/13In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fadezanunadafik.myartsonline.com/can_i_drive_alone_with_my_permit_in_oregon.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/pemoxibifexa.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/basic_science_and_engineering_drawing_book.pdfIn PDF document text
    • http://durenifujogax.myartsonline.com/pukusaporiz.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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 5264 bytes
SHA-256: e57da40cf580bc91a77bdfbe55006e3215fb6ed2ff005bee98c30eea8c240622
font_01_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 10964 bytes
SHA-256: 96d4de900e5e27fb3f6fa5244eedf78d14d4ee244a32db348dc4456c8c06394c

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