Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f0add070d96644…

MALICIOUS

PDF

77.5 KB Created: 2021-06-01 16:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 096aecc29625f6e68576ebba3054ff06 SHA-1: 28f2f250525c0ac6aea2b57842aefdd30d739caf SHA-256: 90f0add070d966440aa9c28024de6f10e5d8ed57b453975a75e6ea23401abec3
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded URI pointing to 'https://baarspo.ru/123?utm_term=presentation+cue+cards+template', which is indicative of a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://baarspo.ru/123?utm_term=presentation+cue+cards+template PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4393503/normal_60b41fd78a7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_600b78bddca3a.pdfIn PDF document text
    • https://bewanabexujafo.weebly.com/uploads/1/3/6/0/136050633/noxusibuxegimase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5ff832e45ef56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_6003f5a56524c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_606059832ec2a.pdfIn PDF document text
    • https://fevowavekotaxuw.weebly.com/uploads/1/3/4/6/134635114/6413658.pdfIn PDF document text
    • https://nuwukovodikala.weebly.com/uploads/1/3/4/6/134666266/2130322.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/sixoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_600d0b78537c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_603209178ead6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_603d03bdec5e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450884/normal_5ffef8489ebe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_6055b6a9b8910.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/nigenozoni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cb2a51-b740-4e15-8333-b24bc5fa75c5/cutting_edge_elementary_vk.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/78377901293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9062c6-e2c5-4902-a291-c47281f75f15/garmin_55_installation_manual_for_certified_aircraft.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/how_to_hack_someone_cash_app_without_human_verification.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144438543/56981623970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef06de7-81ef-4eb8-880d-eb26050d4e8e/teselebefo.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/bapufidojurafusubibulevig.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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 5220 bytes
SHA-256: 1a0efb1ab871b661151e0ffccd42a407ace4e1e097083d0e6e52ed771d5c640c
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 10736 bytes
SHA-256: dbd8e87adad30e8a2905c3a06b819661bddef5b5a063e8cd0599d8f4672c23cf

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