Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33fde45ec60487c…

MALICIOUS

PDF

82.4 KB Created: 2021-05-14 03:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 312bd1098e75b306f6bf9875e553b040 SHA-1: 944c5a1c8b8c3789e01a127bcb0841ba11c90bb1 SHA-256: b33fde45ec60487c9df16446bc08f04bdd6f13127ae6c4ab2c36eed8e2b01d4a
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://botokaw.ru/strik?utm_term=free+play+scripts+for+elementary+students PDF link annotation
    • https://xolejapu.weebly.com/uploads/1/3/4/4/134491856/1326017.pdfIn PDF document text
    • https://rakatifuz.weebly.com/uploads/1/3/5/9/135964199/584f5.pdfIn PDF document text
    • https://tugoxalimirufa.weebly.com/uploads/1/3/4/3/134310877/wevutiwupo.pdfIn PDF document text
    • http://tevfikyuce.xyz/zogilutibawixunudiperrzf6c.pdfIn PDF document text
    • https://lilobisuzi.weebly.com/uploads/1/3/4/6/134695815/58c86adb81bc.pdfIn PDF document text
    • http://gufutaca1.xyz/ps4_gta_v_money_cheat_codesva1ko.pdfIn PDF document text
    • http://ionatr.fun/the_wrath_and_the_dawn_webtoon_season_2wksse.pdfIn PDF document text
    • http://thiswaytovogue.com/microsoft_powerpoint_design_templatessvf50.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/vipomigafegiw_papudugejaf_vomigariz.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/canon_powershot_elph_160_price.pdfIn PDF document text
    • http://telupizevos.iblogger.org/sejarah_adolf_hitler.pdfIn PDF document text
    • https://leximefowa.weebly.com/uploads/1/3/2/6/132680903/1544527.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/wuvugesevenoxibemirop60yau.pdfIn PDF document text
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/vodudab_guxuj_tatikaged.pdfIn PDF document text
    • http://xunajoza.22web.org/26164677170.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/foboxetarabal.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
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_cfadf22e17304dbfae6f44945e76030d.pdf?index=trueIn PDF document text
    • http://rupesujutiwu.myartsonline.com/lifej.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_6cff4d36c9564ac8af94a75abf052eda.pdf?index=trueIn PDF document text
    • http://visunes.myartsonline.com/72465888663.pdfIn PDF document text
    • http://menivafanar.epizy.com/envision_math_6th_grade_practice_book_answers.pdfIn PDF document text
    • http://nafabumawo.rf.gd/2nd_grade_math_worksheets_money_word_problems.pdfIn PDF document text
    • http://bageradafasuk.rf.gd/free_cakewalk_plugins.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_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 5240 bytes
SHA-256: 84d186aeae48b47e91164b61c7af5184bfdcb091070a173449bd0bb800e09102
font_01_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 11028 bytes
SHA-256: 3008ea7da2a7b871dba23750b57f91cdcf78e7e1a7c72f7a93381bb12bf453ca
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361