Malicious PDF — malware analysis report

Static analysis result for SHA-256 3061e9b905ced85a…

MALICIOUS

PDF

74.4 KB Created: 2021-05-12 21:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fe55b2d8d4980e29915689c9f0a479a6 SHA-1: a811a4c2f7da3073d485c7f0c2094161856bbeb7 SHA-256: 3061e9b905ced85ac5ae02e41b4d2a36dd751ae1665c31f6f054ca5082742702
126 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, appears to be a lure related to 'Little house on the prairie season 9 episode 10', directing users to external URLs. The presence of numerous links to disposable hosting and the ML classification strongly suggest a phishing or malware distribution attempt.

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://pelibifir.ru/strik?utm_term=little+house+on+the+prairie+season+9+episode+10 PDF link annotation
    • http://trysalon.xyz/juz_amma_mp3_mishary_alafasy1x1vg.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/83206325069.pdfIn PDF document text
    • http://all-host.site/beginners_guide_to_constructing_thez0vmb.pdfIn PDF document text
    • http://zanartcc.net/distributor_and_consumer_management_system_report_moduleb4xsx.pdfIn PDF document text
    • http://goxamid.mypressonline.com/piscicultura_familiar_no_amazonas.pdfIn PDF document text
    • http://profapp.pro/luraxozakazoto2gena.pdfIn PDF document text
    • http://digitalcalakk1.xyz/scrum_master_trainingd2mso.pdfIn PDF document text
    • http://healingtunes.ru/togavw6vn5.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/beatles_blackbird_tab.pdfIn PDF document text
    • http://fajafifog.mywebcommunity.org/baseline_nursing_assessment.pdfIn PDF document text
    • http://fasadi.site/xidavabaganuzuwivededavvfyet.pdfIn PDF document text
    • https://vatemiseviweriw.weebly.com/uploads/1/3/1/4/131453097/zotilulaki.pdfIn PDF document text
    • http://chategratis.online/newton_s_laws_of_motion_worksheetgh9vk.pdfIn PDF document text
    • http://dfds.in/principles_of_design_contrast_photographylecjs.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/world_of_warships_kancolle_mods9uczy.pdfIn PDF document text
    • http://boevoenlp.com/cxc_biology_past_papers6b62f.pdfIn PDF document text
    • http://gazozaxuk.getenjoyment.net/xanatukiwudanaxusoweg.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/8929588484.pdfIn PDF document text
    • https://tijukubi.weebly.com/uploads/1/3/4/4/134458902/205bfb2a381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirigofov.atwebpages.com/fenuju.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/problems_facing_african_historiography.pdfIn PDF document text
    • http://romakilax.myartsonline.com/accurate_ring_size_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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 5340 bytes
SHA-256: 2ba1e89bb88d4ba73e7211943e862eecf3e9cbc8b1015ef386da393062152399
font_01_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 10588 bytes
SHA-256: 40c3b668c60131f7928b260bd9ae0cb8c60ce340b2f5c6233f2483ea0ad36dd9

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