Malicious PDF — malware analysis report

Static analysis result for SHA-256 8beeb8514be7a569…

MALICIOUS

PDF

86.1 KB Created: 2021-04-01 16:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f0656ec75e68503173adaace0530792 SHA-1: 8d3f3fa1e77e3c19bfd302f8de5ff65a9c10d872 SHA-256: 8beeb8514be7a569e6f78ee98bbcf07053a95d267d342c13a585209a3126317d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://zajinet.ru/strik?utm_term=what+software+can+i+use+with+my+cricut+expression+2, which is likely part of the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=what+software+can+i+use+with+my+cricut+expression+2
    • https://rudazijix.weebly.com/uploads/1/3/1/4/131453676/fcd96aca27fe.pdf
    • http://vizezokope.iblogger.org/jukej.pdf
    • https://cdn.sqhk.co/xixewebirike/mSFgdsq/fidget_spinners_different_colors.pdf
    • http://gunaborekigefu.22web.org/74657628669.pdf
    • https://doretufokisa.weebly.com/uploads/1/3/1/4/131438244/3360093.pdf
    • https://cdn.sqhk.co/jisokemefaz/xhhhewh/mirror_home_workout_reviews.pdf
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/1b449b615da.pdf
    • https://cdn.sqhk.co/dixejetafap/fKG6KIc/road_to_valor_world_war_ii_tips.pdf
    • http://lefavapexusa.iblogger.org/bhoot_fm_8_june_2018_episode.pdf
    • https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/3720355.pdf
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/sipasupapesoxarisuju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fiwarirekagugen.epizy.com/bionaire_humidifier_cool_mist_manual.pdf
    • http://mesilixogu.rf.gd/convert_into_word_file_online_free.pdf
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_8687f3055f7e49258e043c1293ba77e5.pdf?index=true
    • http://sejibuka.epizy.com/rbc_capital_markets_investment_banking_analyst_salary.pdf
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_c17d0f7c89ac481b8b0cf72f5668c0e9.pdf?index=true
    • http://kovefevejafuk.epizy.com/59401667907.pdf
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_8afa6bd53fac4e9096c3a219505bfb94.pdf?index=true
    • http://pekuvem.epizy.com/bukiropadutozamubosuto.pdf
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_08dacaa199564ac7888339607d93b286.pdf?index=true
    • http://rugeritubaduw.epizy.com/nagatafit.pdf
    • http://pefodajisotavuk.rf.gd/61543662017.pdf
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_7b4a8da2ede64e8f98777b092693f92f.pdf?index=true
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_95ba7563a0684533864def612a8c1421.pdf?index=true
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_1ea16ea04ded45d39b981a97759c8d41.pdf?index=true
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_aa3ba58e5ba142379ec5f5f7899012de.pdf?index=true
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_44f79d0dd6b24d5ba80373098c76d8a2.pdf?index=true
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_830273e801ce4227a8e39acfcd49a055.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001022a.bin
234c45c4e86b37099d05d2a78976f8655edafd219623e14d8dbc54946a24e08e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 5512 bytes
font_01_sfnt_off000114e0.bin
04611ff054a4fbb38a2f0021893dd83e0de2abb3cebd3eef26be892dd6b94682
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 11380 bytes
font_02_sfnt_off00013bc6.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 4324 bytes