Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfddfea830d7b7b5…

MALICIOUS

PDF

73.5 KB Created: 2021-06-06 22:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc6f3cdb15bba17efcdf1c455eef9669 SHA-1: 74962873167771eeb9709348fbc1d4e7a92b4759 SHA-256: bfddfea830d7b7b5518cb861645bfe4c401ccb6d61f2ecede0a820bc44f51e65
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://medvor.ru/pbw?utm_term=how+to+put+slendertone+pads+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389387/normal_6045111e01d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_5fe9aae86efaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_600ecafca55c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367004/normal_5fe0b6416f68e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_60387ec27ea08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_604de3caef5f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fc89436d9172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_600b1cc9aec09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_604f7ac9c5391.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/e2a91466-8ebe-4dc0-ac46-d84572bd3ff0/honeywell_quietset_fan_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22b214e-6928-4d13-9846-d705b4e39548/whats_a_mean_word_that_starts_with_o.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85d7f0c-51ad-4e17-bac3-c5c94427404c/quantum_mechanics_for_dummies_free_download.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/family_guy_the_quest_for_stuff_hack_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2261083-9a7b-4643-9998-350c17771a7a/how_do_you_write_a_case_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f40d39f-8893-44b2-9cc7-1686aa7f82cd/carta_de_crdito_como_funciona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c2495d-fd26-4e78-8776-89f2cb7c9e37/star_trek_william_shatner_books.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/w/file/fetch/144443556/how_to_draw_a_butterfly_outline_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded0f24d-9bf0-4960-89a7-899f5481428d/85176863056.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144418746/how_to_put_onn_earbuds_in_pairing_mode.pdfIn PDF document text
    • http://fupimogevif.pbworks.com/f/why_cant_i_print_to_my_airprint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9943d1-fd42-4e6c-9376-5a8e07529ab2/40762811949.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144591558/55802441274.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_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 5004 bytes
SHA-256: d5ad26a5c7bb04ca423ba5f7fd1257a24ef6b0b09b148415ed2a3f7eb6bfb6ba
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 10536 bytes
SHA-256: 0a4523c2c8b49948ebecee02361b96ae0546ca113cd03761884a34db3401c949

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