Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18a256b5ebb85d8…

MALICIOUS

PDF

63.9 KB Created: 2020-12-23 03:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a2cd3f0e87b53332af23b67fa8446067 SHA-1: 88e7b781ea60bf4aa13a1991739d3d0b50aaea5d SHA-256: a18a256b5ebb85d804eb2f4362f3d9b12b44b895df9997b57b8a1e98d3fcfc4b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URL point towards a phishing lure designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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=keystone+8mm+projector+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5f9b53f1753db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b797aa5f-ce60-4b86-9382-19b51d4e0b6e/12105218917.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/mowigigunosulavapuj.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/aaj_tak_live_news.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/54629469341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2d5f61-06a4-4925-b8a5-e99c9364ad6d/jarekojipid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29da2a62-ee8f-4aa2-89ff-e72cd0a17e2a/rtic_20_cooler_cushion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494effcd-04c6-4d16-b17b-8ac1bc28becb/81092241402.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/danny_boy_sheet_music_clarinet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48cadcae-0f00-49fb-b878-9723b6da9673/color_chart_for_paint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54154323-aea1-4092-8f58-cfae34f6689a/tamil_hd_songs_download_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/4307966942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782c5f93-c126-463c-a2db-3334cc65ea5f/nustep_trs_4000_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_off0000b26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26C 5420 bytes
SHA-256: 993d338bb32e36e52afc9798d381b3ad5eb5b05630447257dc040e4af08d3d12
font_01_sfnt_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 14204 bytes
SHA-256: bba1027b4ac6de7971046cd20922d6d291a107e0190bb0b271e8abffd37e97f9

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