Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a66230d4491c2ca…

MALICIOUS

PDF

67.8 KB Created: 2021-03-03 18:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: de170d59a2e6a6f29d1e2e66b63b9b46 SHA-1: 39e1c92eca378f93cca6a430fc8c63a91c0eab3e SHA-256: 9a66230d4491c2ca4dce74442be29e44e9b033aee418249110829c47bf56690c
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/wix?keyword=sentence+stems+for+reading PDF link annotation
    • http://liwexun.mywebcommunity.org/how_to_unlock_a_sentry_safe_with_dead_battery.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/is_panda_express_chow_mein_keto_friendly.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/queen_of_shadows_dianne_sylvan_read_online.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/26879466323.pdfIn PDF document text
    • http://testertumentum.space/amharic_bible_study_question_and_answerih6cy.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/12379550471.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibizuladode.onlinewebshop.net/zegaridibebipun.pdfIn PDF document text
    • http://fudowoxalukiki.rf.gd/79327302036.pdfIn PDF document text
    • http://wijetifosoxi.epizy.com/charging_port_replacement_android.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/have_a_pleasant_day_quotes.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/11946534601.pdfIn PDF document text
    • http://sunemixawuvija.epizy.com/verona_wikitravel_guide.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/nofuduv.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_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 5412 bytes
SHA-256: 1a121fbb84bebc5eee4bb3f46c3884f86e0901f4514b37b39c122dd96d521e11
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 10016 bytes
SHA-256: 5a4fdf8b120e3d500e446d6b553bf9445beb0583f86a528eeba9a2d009e84419