Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f3c6d40bfaad43…

MALICIOUS

PDF

72.3 KB Created: 2021-02-19 02:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 98ec49b163d561894afeae848084b10d SHA-1: a4797cee48bcecd79a6c229274017a1434b0177a SHA-256: 25f3c6d40bfaad431d2b057e9352414faeb7551112fe28af059ef3b8b0f0e646
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a redirector link to malicious infrastructure. Another critical heuristic flags it as a link farm, suggesting a broad distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=redhead+gun+safe+accessories In PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/7943302.pdfIn PDF document text
    • http://witejafekomip.22web.org/ross_carbonite_ultra_manual.pdfIn PDF document text
    • http://wegijezunulej.22web.org/wagozogigidudiputojeraj.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/hgKVtUZ/juegos_de_stickman_dismounting_gameplay.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/wamivu.pdfIn PDF document text
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/119a36cc.pdfIn PDF document text
    • https://cdn.sqhk.co/konarolikomu/ceCOhj1/pay_for_real_instagram_followers_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/Shfjijf/toolbox_for_truck_lowes.pdfIn PDF document text
    • http://all-system7.work/jiro_dreams_of_sushi_torrentx6m55.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/nitatotol/5551143076.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/hand_lettering_practice_sheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/zedojazuwokobosi.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/kesem.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/firawogipizuzilixeger.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/nonewuretokuvivin.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/mofedap.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/amana_electric_stove_manual.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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 5260 bytes
SHA-256: 958b8c6068ee4cf76f37b7c3d1285a95f655311198ae09114a08259ba334a154
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 11080 bytes
SHA-256: 0f06e7721b0d85a782aa5b6ede2820406ddedc801949c57c11f2d20031c02623

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