Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ce28fe13cac80f…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 02:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2564b0cde09506bf07d5e2cfb99fd3e8 SHA-1: 494538725799a0357a4254e1e3f96c1c3135a815 SHA-256: 81ce28fe13cac80f771a4bb3f85ea67fc7d311201e3b22de0b4c1fc9ef94d194
166 Risk Score
Tags
free-cdn-ebook-manual-lure

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 a password-protected-archive lure. 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 0.9999

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lozipotod.ru/award?keyword=informal+business+report+sample+pdf PDF link annotation
    • http://politach.com/cloudy_with_achance_of_meatballs_2_clip-_berry_rescuei6usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_604e81aea8311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392220/normal_5ffc11dc1d323.pdfIn PDF document text
    • http://meetsalle.xyz/descargar_internet_explorer_9_para_vista_gratis_en_espaol0bfrq.pdfIn PDF document text
    • http://steblin.pro/fuvafokezepebxk7ri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5fc5a11c955eb.pdfIn PDF document text
    • http://lovemecompletely.com/84452665632ekvom.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_60430251d9000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_5fd1b56f83c4c.pdfIn PDF document text
    • http://bettermoneytips.com/fulozezesuwa051ou.pdfIn PDF document text
    • http://obmenkalnr.online/kininanimidolizikolanewu01yu.pdfIn PDF document text
    • http://uscarins.info/sinner_in_the_hands_of_an_angry_god_rhetorical_analysistz2ph.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_8a591e300e424097af6cdb6a9e9be68d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/functions_worksheet_math_aids.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_c6cd1f1d9525466ebc05b6d413d84087.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_8e7efcef908c407b9c6f589be9dc7cb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/salary_in_probation_period_in_rajasthan.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_0e7f6f42df85403f83a90684d6ad69a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/adani_berthing_report_mundra.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_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 5264 bytes
SHA-256: b94149bb423cf6e692a53d9a821f76f2eefcaff4bdcfd0843d843cf2631c53f1
font_01_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 10384 bytes
SHA-256: 20cf8f474aa8a939c16a340093c5cd42b8dcbaafaff63810674cef22ca5542d3

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