Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dff4bdb64c8ba18…

MALICIOUS

PDF

68.8 KB Created: 2021-02-18 01:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 61ca9b13f0941cfd6de39f2fd663b633 SHA-1: 7f8e317a64bd491a8cb4313d3f668d723871b432 SHA-256: 2dff4bdb64c8ba18a65a330ebfdcad7a44048e1defaefbceb2778a0ff53f638e
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. It embeds external URIs, including one that appears to be a search result lure. The primary malicious URL identified is https://baarspo.ru/wb?keyword=how%20to%20clean%20baby%20einstein%20jumperoo, which likely serves as a landing page for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=how%20to%20clean%20baby%20einstein%20jumperoo PDF link annotation
    • http://wikurabafewo.iblogger.org/42510585181.pdfIn PDF document text
    • http://defiboxifef.22web.org/how_to_become_a_veterinary_tech.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5fe6fa264a2a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388048/normal_60095eb267bcb.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/6399589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisazabe/loveland_accident_report_colorado.pdfIn PDF document text
    • http://wotawegij.rf.gd/compliance_policy_guide_7150._09.pdfIn PDF document text
    • http://segoxegigo.epizy.com/watorogojepuwefo.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/buwasoxuvaxi.pdfIn PDF document text
    • http://kalilom.epizy.com/16833102285.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/mejores_aplicaciones_android_para_editar_fotos.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/captioned_performance_at_lyceum_sheffield.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/wapking_new_video_song.pdfIn PDF document text
    • http://pibufesoxol.epizy.com/projector_screen_installation_guide.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_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 5448 bytes
SHA-256: 9ca6d3db9b094f8a1e2c3bafe294a0e1190e092b66da498cc43d24c7a7f29691
font_01_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 9940 bytes
SHA-256: 33e44763ae7faa524cb7817b70f44a753d3f898fbe48760bd3d235b2e94fc51f

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