Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6485fd778d277d4…

MALICIOUS

PDF

103.2 KB Created: 2021-06-02 16:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2e7eb7b310868bb5f6f9e5b1903599ab SHA-1: ebf516b5d26806b0001389a25ca6a8d76befe3ba SHA-256: a6485fd778d277d466d2420da754ac774b7a2591b0b6ee4fb97e2087c05feee7
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/pbw?utm_term=camino+al+minimalismo+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375356/normal_606b5296e2517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_6063c527b0c85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_601ed5fa6a876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_6052462bceb73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_603fb57f70cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495997/normal_604ad1dd18882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418188/normal_5fccffd43a935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_605d13cbcc73e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufujibumufa.pbworks.com/f/fleischner_society_guidelines_for_pulmonary_nodules.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/f/erie_metal_roofs_pilot_program_reviews.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/how_often_do_you_clean_cpap_with_soclean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6349efeb-be6a-41f7-a8e3-d2b8d169befc/asus_rt-ac66u_openvpn_server_setup.pdfIn PDF document text
    • http://depowota.pbworks.com/w/file/fetch/144510657/how_to_write_a_literature_review_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb671d4-2223-4aca-b98a-aa2916e4ad75/how_to_know_whether_a_compound_is_ionic_or_covalent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8dce9ce-c631-4064-a7ba-d725efec9849/51211676609.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/65455744368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb499903-f50a-45c2-869c-da3f3200cea8/ponoxalofezogagawud.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144414495/82554640604.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/f/bissell_powerforce_helix_brush_not_spinning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60b30b8-2e4d-4e3b-a742-41262163d9f5/canon_pixma_ip90v_printer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0A 5268 bytes
SHA-256: d999921dc04371ea943dc48f1bddf59adf130e412e1fc36e1ede3e2a0856744e
font_01_sfnt_off000150dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DD 12260 bytes
SHA-256: 8d29163920ed20151c8354bdb2109e593495fb1dc8b252b0007452dd7836fa49
font_02_sfnt_off00017905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17905 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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