Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd08dbf847ed88c8…

MALICIOUS

PDF

67.4 KB Created: 2020-11-25 22:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aa9addb7752a67c5fec0cec8c5511c50 SHA-1: 5c97d326f655263be37652ca00ff0a56ff2a0a7b SHA-256: cd08dbf847ed88c85fc634bdeff5a52c75a43d0a01ba4ef9ca78dfbb9be198b9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=mathematical+olympiad+treasures In PDF document text
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/noxunidijofoki_dukokuzugo.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/8774348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dazifozixawus/demographic_information_meaning_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/nitro_type_hacks_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/unit_5_progress_check_mcq_answers_ap_lit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553a641d-1965-4885-815b-000d885fd050/56209460649.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/dapelorifuzofopiwopugixu.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/27486481685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28584c70-3498-4a0d-8c17-5acf459d74b1/41512329113.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/cancionero_de_baladas_para_guitarra.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/juego_tradicional_zuliano.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/81770484718.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/96874153286.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/24808654087.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDC 5196 bytes
SHA-256: 855f1b73b08d66bad24fdc53f11e4ea27f16df02c1a8d02d06f7be66839fb5e5
font_01_sfnt_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 11136 bytes
SHA-256: 5edf84970c7eeffb3fff6682c588964cd9e5b1bd4fbb33f2078de1a9516a0d02
font_02_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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