Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bdfe9ae85fbadc…

MALICIOUS

PDF

81.1 KB Created: 2021-06-02 16:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7b6070f05fc14d36ad224035c2defd2f SHA-1: e75f26cf82f29c1640bc08034066a420ed0c8e73 SHA-256: b0bdfe9ae85fbadcbaca6f453b51a3edd75fdb14efa5a5e9a5aa54c76dfc7c5e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/123?utm_term=free++animation+maker+for+pc PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4384459/normal_60b4e9213f1fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_6061d1761730c.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/rinotaxeg.pdfIn PDF document text
    • https://nubodizigo.weebly.com/uploads/1/3/5/3/135346475/1796676.pdfIn PDF document text
    • https://getawotenag.weebly.com/uploads/1/3/4/4/134443600/bosoguxaluradoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466391/normal_5ff0cca244bf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ronuzexem.pbworks.com/w/file/fetch/144427506/amazon_blue_badge_conversion_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fd9abe-ae7f-4a03-bf7e-2eb55b803ce4/fonot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fa0e0f-01ac-481d-883e-a170d4ac240f/medicamentos_para_ardor_de_garganta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5ff3c0-bc01-40a2-897e-9fef1aec2d49/the_conference_of_the_birds_book_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19f8c28-9a99-4d94-a607-f9aa320e7b4e/41664670254.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144413241/the_power_of_critical_thinking_5th_canadian_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ff671e-52c2-40bf-a56f-af608aa82b8d/riniluxugofin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8365e8-d8fd-4fb4-8617-909bf94c0c01/fudutopenesilogam.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418521/consider_the_lilies_of_the_field_piano_solo_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b71054-3d09-422d-97c3-41f201ede3b9/lilujuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f7c87a-f857-4258-952e-1ce42b47aebc/counter_terror_2_mod_apk_download.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144459924/apc_essentials_of_forensic_medicine_and_toxicology.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_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 4968 bytes
SHA-256: fa4321c5176fbd68fb6937eb531247c6698d094f8b295685249204fea71016ae
font_01_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 10912 bytes
SHA-256: 377d21bb7986419da7eaedda6d8ced7ecf427ff2f7d6a62db2d53ddf3a95ca25

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