Malicious PDF — malware analysis report

Static analysis result for SHA-256 81669e2b9b1f9896…

MALICIOUS

PDF

76.2 KB Created: 2021-06-03 08:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c14dcb54eb5a7d20ca953100df28cfd4 SHA-1: 97c3ba3697dc9063eb40af829141671431d74814 SHA-256: 81669e2b9b1f9896e83174bd59a61112e9269e751054b24f988357dcf3397ed2
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating it contains a link designed for phishing or malware distribution. The embedded URL, 'https://soxebez.ru/123?utm_term=consolidate+data+from+multiple+sheets+excel+2010', is presented as a lure for consolidating Excel data, which is a common social engineering tactic. No scripts were extracted, but the PDF structure and URL suggest an attempt to redirect the user to a malicious site.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://soxebez.ru/123?utm_term=consolidate+data+from+multiple+sheets+excel+2010 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391319/normal_603d4490f0a05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_5ff5ecd9b0bad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501501/normal_5ff2f07b56ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_60121ebcef9f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_604d3566e263e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444648/normal_6049307896b6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_606e2e02d3ece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5fdc006a0d42a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_5fe9fc6386e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_60501b7bcf42a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443804/normal_60078a560c46c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501484/normal_5ff0a466cb26f.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/d98f9d03-2a24-4c04-a149-b5530c550cd4/tezarovepuwibaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2731ea-02c8-4bb0-91f2-78e76834b0f3/jabobavelusonepidezikonir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec11895-1023-4b0f-8c73-2b8b4a5f8f7a/62949696613.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/w/file/fetch/144532554/whatsapp_spy_007_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a09bd3-7dbd-432f-b2c3-0c96a36f09db/83347449258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8418bd6a-0da3-436f-8bbd-221ea0af68e1/how_to_play_xylophone_marimba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b7a978-9038-4433-8f94-565285224dca/garmin_60csx_topo_maps.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144474969/exercicios_de_ingles_simple_present_com_gabarito.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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 5692 bytes
SHA-256: 5d94ec85fbff86585688f03112743baddc9c80419c282e9c5009552b29d2d9e4
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 11184 bytes
SHA-256: 0edac02b18b6a12be6bf864a14e8fb362ad9f04a30161b9b21e648e70f04e5c1