Malicious PDF — malware analysis report

Static analysis result for SHA-256 0893d5230b5cf08f…

MALICIOUS

PDF

75.3 KB Created: 2021-03-31 07:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3187c9608f59c03a86392d3949f7bb88 SHA-1: b538772b5619afd9345e11796f264ea5b14aeb34 SHA-256: 0893d5230b5cf08f2ebc54f6dea70f9a79f9447fd07cfdc6af7a6d433fd6222f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'acid deposition worksheet answers'. The presence of multiple disposable domains and link farms points towards a campaign designed to redirect users to malicious content.

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://golowaki.ru/wix?keyword=acid+deposition+worksheet+answers PDF link annotation
    • http://wumiwuzigimo.mywebcommunity.org/10720831990.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/UWlpjgw/70270550466.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/iegiPje/4024153545.pdfIn PDF document text
    • http://kutegexuwudaro.getenjoyment.net/soxusofokopugagebopit.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/hImngkp/84709182555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gimusatis.rf.gd/zapizigovurikubupaluwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8151b169-02f8-46ae-94f1-935d4c50b0ae/wheel_of_time_tv_series_trailer.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/25749811720.pdfIn PDF document text
    • http://korotegimokuv.epizy.com/ae_ganesh_ke_papa_hd_video.pdfIn PDF document text
    • http://pozajuw.atwebpages.com/39621722546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da5ceaa-b837-4d01-9a5e-65b9315db57f/43580588491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec24263-446d-483f-9201-0a46ddfa1076/ginagavelowotivufozu.pdfIn PDF document text
    • http://suzifoki.myartsonline.com/36043514297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42194e3-e5d3-4b1b-8996-33b8b787ad13/a_clash_of_kings_illustrated_edition_download.pdfIn PDF document text
    • http://dagilupakov.rf.gd/59388640870.pdfIn PDF document text
    • http://bapomel.epizy.com/9040341197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866e68d8-4350-4e60-83e2-18298e5a0074/43191599786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f59990-a859-4270-9f26-9b90f660bfb4/steve_jobs_biography_book_in_marathi.pdfIn PDF document text
    • http://zimofizamar.epizy.com/xowavoparu.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_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 5272 bytes
SHA-256: 253aed6c758ebc4631b6faec6250ea6434ae4623ed0d598360721d62e5df67b8
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 10736 bytes
SHA-256: 0f0f20cc18c8b20c96f8e28721915d6787f0a065b34deb460de5788a980ff1d2

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