Malicious PDF — malware analysis report

Static analysis result for SHA-256 da85d6e472263928…

MALICIOUS

PDF

76.9 KB Created: 2021-04-03 23:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e9aaeeb3c3092f5aefee25fdb23fc5b1 SHA-1: 55e4facae05182952085aeea71b4cb3a59ee2110 SHA-256: da85d6e472263928b1135049e19f915b3aa620ab31d1b02ac21dd2a6f9eefc73
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. It uses brand-impersonation credential phishing. 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 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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dodirubiv.weebly.com/uploads/1/3/4/5/134505429/92f61075.pdf.
  • 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://resalured.ru/wix?keyword=sony+x81c+manual+pdf PDF link annotation
    • http://50off.pro/iso_27001_compliance_audit_checklistlrxp1.pdfIn PDF document text
    • https://dodirubiv.weebly.com/uploads/1/3/4/5/134505429/92f61075.pdfIn PDF document text
    • http://lurodug.iblogger.org/27269103596.pdfIn PDF document text
    • http://getcreditcheck.info/higher_chemistry_data_booklet_201979vqg.pdfIn PDF document text
    • http://50offit.pro/vigimiwagowarasomuxkmwu.pdfIn PDF document text
    • http://tabikola.online/dozujepumowoto3jf93.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/lokafoletubabojuxabavo.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/wastewater_treatment_system.pdfIn PDF document text
    • http://center-san.ru/rumavajadiverevi30bml.pdfIn PDF document text
    • http://xuzevofut.22web.org/jerebelinumuginem.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/5646799.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/80603495689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/9944366277.pdfIn PDF document text
    • http://gegavolaful.epizy.com/what_is_the_height_limit_for_infant_car_seat.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/diccionario_espaol_en_descargar_gratis.pdfIn PDF document text
    • http://xawunivirufoz.epizy.com/83753255414.pdfIn PDF document text
    • http://xofogijatoli.epizy.com/38470391484.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/software_company_portfolio_sample.pdfIn PDF document text
    • http://gekuxexotomilo.epizy.com/6488211104.pdfIn PDF document text
    • http://wekiwuja.rf.gd/digestion_de_lipidos_en_monogastricos.pdfIn PDF document text
    • http://fapomotomojopog.epizy.com/wewiwizelubagaraku.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_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 5544 bytes
SHA-256: 178c7d9dce0c9a19a560a2e541d84495748d657f2bfd89e09baac8471147d4aa
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 11632 bytes
SHA-256: cc4d0d65886e10068d679a4f71d484d4141266ae104c73932c2e282cb869a57c

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