Malicious PDF — malware analysis report

Static analysis result for SHA-256 862fee41c59735ad…

MALICIOUS

PDF

68.6 KB Created: 2021-02-10 02:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8b70eb067b9b165437de42c49b40c3bf SHA-1: 61362501ca0fc35493ab298c5785712b07213604 SHA-256: 862fee41c59735adcb1e99824fa536efd63b9abb843a5265b29a59d729a96575
184 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The numerous embedded URLs pointing to disposable hosting services strongly indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=bescherelle+allemand+pour+tous+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4488810/normal_6018ca3e19938.pdfIn PDF document text
    • https://kuxifegofemiza.weebly.com/uploads/1/3/4/8/134865321/zinesapezosina_dokivatoretu_pijijasumovo.pdfIn PDF document text
    • http://hs-life.ru/lewed506nm.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/wujunekigox-kugonozozud-zunevuw.pdfIn PDF document text
    • https://pivokobofu.weebly.com/uploads/1/3/4/6/134648089/55686830a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_600a0806f232e.pdfIn PDF document text
    • http://dostafood.xyz/25566879171i8866.pdfIn PDF document text
    • http://namedaun.fun/92813125890km6v5.pdfIn PDF document text
    • http://draiwenstore.online/dirogifagotujasujamanosde297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410020/normal_60001ffa0e3dd.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/jopixebuni90j2e.pdfIn PDF document text
    • https://magajasomit.weebly.com/uploads/1/3/5/3/135388043/3617621.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/3407076.pdfIn PDF document text
    • http://ig-copyrightviolation.com/new_builder_games_2020_ps48o5e1.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/4873057.pdfIn PDF document text
    • http://vamoktin.ru/time_measure_worksheetalmxi.pdfIn PDF document text
    • http://wutomomar.22web.org/constant_of_proportionality_worksheet_answer_key.pdfIn PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/bdefa197f25e84f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesegusanasukan.epizy.com/sql_report_builder_if_null.pdfIn PDF document text
    • http://tanozetodane.rf.gd/raxupide.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_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 5444 bytes
SHA-256: 32296f86dbb77fdf29c235eaf3a89f6e2a693c43e9848da26b149a0f058cb847
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10544 bytes
SHA-256: bfa70eeb8f105b9f641f6db98608f3b9b767eba88c278cb3afed014eebfc99c6

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