Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc33773ca33a10d2…

MALICIOUS

PDF

72.7 KB Created: 2021-03-09 10:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a709c8322cd68144620fedcdbdd710a6 SHA-1: a5ef74630e3efb0a7c05d86fa94e174a86d96c4f SHA-256: bc33773ca33a10d27553cbdc15b498033dde765e598a9ebf89dba547f7578e22
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • 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 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://pelibifir.ru/wix?keyword=geometry+similar+polygons+worksheet+answers PDF link annotation
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/8713403.pdfIn PDF document text
    • http://dekoriribazovax.mywebcommunity.org/94840476238.pdfIn PDF document text
    • http://vosalax.22web.org/xurozolewavovevem.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/jasogomajudirotogoranunof.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/bebupavakogaw.pdfIn PDF document text
    • http://xuxogez.22web.org/is_the_sao_light_novel_over.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_6036c6fa57d09.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/5798699878.pdfIn PDF document text
    • http://mewuravis.iblogger.org/86006539786.pdfIn PDF document text
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/bazetamenofavuzuwe.pdfIn PDF document text
    • http://sofoviwov.iblogger.org/55967431418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_6021a6ed106b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_6045086bc0bec.pdfIn PDF document text
    • https://morisefomu.weebly.com/uploads/1/3/0/9/130969566/sodopegis_liromote_pufapigowoneka_vefuxonigu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vewemisesafi.epizy.com/como_citar_un_autor_corporativo_ejemplo.pdfIn PDF document text
    • http://wekidezeze.epizy.com/blackmart_apk_2018_v2._16.pdfIn PDF document text
    • http://jagogapibibolin.epizy.com/avakin_life_mod_menu_apk_ios.pdfIn PDF document text
    • http://jebediz.rf.gd/piwiwiv.pdfIn PDF document text
    • http://vemesivudaro.epizy.com/landlord_notice_to_end_tenancy_uk_template.pdfIn PDF document text
    • http://sixanuramusasit.epizy.com/fobisewidemalinafidi.pdfIn PDF document text
    • http://punozelejewi.rf.gd/vinuwozuvexumo.pdfIn PDF document text
    • http://gipuzasidu.rf.gd/proform_505_cst_treadmill_best_buy.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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 5520 bytes
SHA-256: 8cfda69f90ab78890c88d21d8a157219d3f1ecd128ec58514b34de97698a2ad0
font_01_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 9836 bytes
SHA-256: 2bd9e6de8bc61e9dd34d233d607c1a7a1fc1c290cf6b1da594e1bb70a1cdd884

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