Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bfa14c48e337e9…

MALICIOUS

PDF

69.4 KB Created: 2020-12-11 06:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c292fb9b05b907c0cc7fa534d5922e0a SHA-1: d6d09d5c5441d6930a9ca8b040ee25c4a31c050d SHA-256: b7bfa14c48e337e9bc83062106e7fbbcf322f62ed52047531f65f7ad0e0a2cf1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It impersonates a cloud document sharing service and prompts the user to install a browser extension or update, a common lure for credential theft or malware delivery. The embedded URLs, such as 'https://traffset.ru/123?utm_term=captain+marvel+google+docs+movie', suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://traffset.ru/123?utm_term=captain+marvel+google+docs+movie PDF link annotation
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/pisug-xavepa-nixilafumu-javifobef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_5fb7472830dc9.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/6c5a43.pdfIn PDF document text
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/favitoza-wilegiseve-bozebuzakopu.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/nedotadanula.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/460f9d.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/gasodamuza/pixexinujomoxagofol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f8c765-39f1-4aa2-9335-41b98629c9cf/61658062527.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/zero_conditional_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8496d736-c0f5-4371-b42b-e20ba1260553/77185329793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad61f26-c4e0-4442-bd40-b94847643233/41467013693.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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 5356 bytes
SHA-256: 7dce9fe3748089c38291323bdc896edd582d4e25bec467ac8d5556468fbc8276
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 11832 bytes
SHA-256: 414bfb3ad85bad4daf1430a66245de82b5fa9ea4d737126c5ebb3bf509d3fb48

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