Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f142d40a0ed4348…

MALICIOUS

PDF

68.7 KB Created: 2021-04-26 05:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 62eb8a8ee1e3ba9678b1791d1749dc38 SHA-1: 82994f1b400940e967a85441a2b02b4ee697ebd4 SHA-256: 4f142d40a0ed434801a3c9d67b4b07d13a0519fa76f70a9550aa60c6d11ee519
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 0.9998

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://xajibur.ru/strik?utm_term=masimo+rad+8+finger+probe PDF link annotation
    • https://cdn.sqhk.co/libuzewis/Mhjihhi/31560204034.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/KijeV7C/bigbang_kpop_debut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_5fd9f5f989c7a.pdfIn PDF document text
    • http://sayseedokg.com/mastering_chess_strategy_book_reviewm8w41.pdfIn PDF document text
    • http://saxozumipelezip.22web.org/livefedamo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ff9d2e3b1cb4.pdfIn PDF document text
    • http://ctuxuu.com/panabozadevirubugg8k6q.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/rFjhY9C/serial_killer_coloring_book_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5ff18433d53e4.pdfIn PDF document text
    • http://tuzotumefakorok.scienceontheweb.net/alto_saxophone_altissimo_chart.pdfIn PDF document text
    • http://talajudoxuxip.mygamesonline.org/cancer_mammae.pdfIn PDF document text
    • http://yoptan.space/dj_khaled_im_the_one_mp3_downloadm58vc.pdfIn PDF document text
    • http://gifinibufenatar.medianewsonline.com/guanabana_annona_muricata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5ff9c74b3f04b.pdfIn PDF document text
    • http://kuvuradivikosef.iblogger.org/human_anatomy_integumentary_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_600dfe4ebe0a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitines.myartsonline.com/grand_grimoire_vatican_archives.pdfIn PDF document text
    • http://xugomoxuniwemo.rf.gd/census_method_of_data_collection.pdfIn PDF document text
    • http://tunufefenus.rf.gd/bluetooth_keyboard_app_for_android_tablet.pdfIn PDF document text
    • http://ridigale.rf.gd/alcoholism_thesis.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_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 5668 bytes
SHA-256: c7524ae2a7c495e2e5f5d46e52e1730bdf08f5de07921d6ead77c503812bd37c
font_01_sfnt_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 10808 bytes
SHA-256: 37348030a41da9c9e1b920b11e97b374e62310d44cb29577ab9ad8b89b3a06af

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