Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1596d0c7bc599c…

MALICIOUS

PDF

76.4 KB Created: 2021-06-06 03:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dd7d73f09cf60a826e1220d811b93f8b SHA-1: 261ca5053def0760065b0967c0d77801ef643c51 SHA-256: 9b1596d0c7bc599cde399812036436f8dba769efdf480ee455d7fc1b4b33903e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary malicious URL identified is smidgel.ru, which is likely used to host phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/pbw?utm_term=did+speaker+knockerz+die PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453332/normal_60b97cbd7f4d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fe829a769edb.pdfIn PDF document text
    • https://kovovovugatu.weebly.com/uploads/1/3/4/5/134599685/5131834.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/duzizonutadurimegudu.pdfIn PDF document text
    • https://fuguweraxawu.weebly.com/uploads/1/3/4/6/134684603/9604563.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/9432259.pdfIn PDF document text
    • https://temabodanifow.weebly.com/uploads/1/3/1/4/131454916/65811790e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ff09402de6c3.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/99fdfe1e-11e9-42d4-8660-ec1dcf34216d/gepagarinokogilozekuzilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d9ab00-4203-428a-af34-be89bca37dc5/mugusobizilezag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e57757e-95ea-4b19-8db7-7d2ddfa1fdbb/66240175512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab65540c-56fb-428f-a93c-7a9f4000e236/81070557684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3970840-36c6-426e-a470-7f43858d583d/87088488953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42819ee5-1b42-4f9a-be80-897f086fd9b2/how_old_should_u_be_to_read_the_selection.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144499245/53013230479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfe7e53-8d76-48f6-9018-b95cc01fea17/gaxoxibukaxagexekaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8e53c0-b7fe-442e-964e-8f9c5cb89d3e/sql_syntax_join_multiple_tables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7536c65b-11da-4d64-b2c8-c068b056b18b/the_princess_bride_epub_free_download.pdfIn PDF document text
    • http://fukibaso.pbworks.com/f/how_to_find_molar_enthalpy_of_condensation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb488743-464e-4ca7-a662-44e5f0bbe33d/zeruwixa.pdfIn PDF document text
    • http://pibadaro.pbworks.com/w/file/fetch/144582693/old_assamese_film_video_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a620a7-2bf0-48dc-a2be-783e24b08c57/human_anatomy_and_physiology_lab_manual_cat_version_12th_edition_by_marieb__smith_pearson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181f4a1c-1fcd-4d5c-9127-37dacd2b5c3f/teluzowovuta.pdfIn PDF document text
    • http://buwutel.pbworks.com/w/file/fetch/144687588/97948166251.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_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 5148 bytes
SHA-256: bbe5556be1a80e076f12a60c1e0dca0acd41e9ffa64faed9dedb4a6aee280c29
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 11252 bytes
SHA-256: f33631aa43899d8b4750ee4b8a22e1c28ee87e58b6e1cb93a9c383bdc731431b

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