Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6637e29b41d59d…

MALICIOUS

PDF

99.0 KB Created: 2021-04-04 23:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: def467cc6818f3c5a3dc77ef9da36101 SHA-1: d06e5bfdf6af1e6de5c17fbab83f3a2ffe031a75 SHA-256: 9a6637e29b41d59d7a966973908fbd0ecf2f1128a8863da749b967e8b734e05c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9978

Heuristics 5

  • 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 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://botokaw.ru/award?keyword=bertholletia+excelsa+pdf PDF link annotation
    • https://cdn.sqhk.co/zirevazul/LBgfvQP/jenezivajutadufubud.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/ca052c88c.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/jiF5if4/4112027602.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/chapter_17_section_1_italy_birthplace_of_the_renaissance.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/86065432410.pdfIn PDF document text
    • http://begotilujaxijis.iblogger.org/defectos_del_cierre_del_tubo_neural.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/66791845464.pdfIn PDF document text
    • https://cdn.sqhk.co/nubavojek/haijkjc/5942642988.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/gm4Ojjm/fc_bayern_munich_players.pdfIn PDF document text
    • https://cdn.sqhk.co/duxisabaza/39IKemm/39250219499.pdfIn PDF document text
    • https://munerotilaxamo.weebly.com/uploads/1/3/4/4/134476206/rajukemosimuso.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/wuvasa.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/zunaxabilubuxajik.pdfIn PDF document text
    • https://jategolotigani.weebly.com/uploads/1/3/4/8/134882723/maxumukekotajeb_dedivokape_xorebur_patikur.pdfIn PDF document text
    • http://keruluzo.medianewsonline.com/kikosis.pdfIn PDF document text
    • http://gejikojaki.scienceontheweb.net/arabya_rajani_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tezitap.rf.gd/64074782292.pdfIn PDF document text
    • http://fazafowunop.epizy.com/911_driving_school_test_2_answers.pdfIn PDF document text
    • http://leparitupoxow.onlinewebshop.net/pin_diode_working_principle.pdfIn PDF document text
    • http://rawozenagi.epizy.com/insert_excel_sheet_link_into_powerpoint.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/patrick_lencioni_ideal_team_player_video.pdfIn PDF document text
    • http://xibubew.epizy.com/lofefukubesifagat.pdfIn PDF document text
    • http://lenegimuni.epizy.com/bhut_pyar_krte_h_song_pagalworld.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/sanyo_smart_tv_price_philippines.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 5040 bytes
SHA-256: 71809c2e0fb58b4f684402be299ac689c0c49a911acddb9fa5cabc691925f4cc
font_01_sfnt_off00012ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 13464 bytes
SHA-256: bf941907a6c9eee5fa4d1747614f6d77e3dcd9ff427fd407e03040cd39e96688
font_02_sfnt_off00015b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B84 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_03_sfnt_off00016fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FEC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3