Malicious PDF — malware analysis report

Static analysis result for SHA-256 7722b0e96fdc51d0…

MALICIOUS

PDF

88.3 KB Created: 2021-03-23 13:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 79c0414fe2b658d8e6b073c8795a8dd8 SHA-1: 5434bd3cb7ca2d416b89ff04af403a6351d58276 SHA-256: 7722b0e96fdc51d0317686b1c67b5a12942b59caa6b711c14c53be03fc4bf769
186 Risk Score

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://nipisod.ru/wix?keyword=jimmy+carter+middle+school+staff PDF link annotation
    • http://pazifelurup.medianewsonline.com/telugu_bible_quiz_app_download.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/lease_termination_letter_from_landlord.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/ie5TDgd/45888195859.pdfIn PDF document text
    • https://cdn.sqhk.co/tinukomafiro/ghIh58o/8d_music_player_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/iajAEJR/mini_pocket_whippet.pdfIn PDF document text
    • https://cdn.sqhk.co/bumajanivosi/hTrghhh/nosugule.pdfIn PDF document text
    • http://zokibijefepixit.22web.org/28632244869.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/jfFS1ic/stickman_unknown_battlegrounds.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/hipije7/free_coloring_books_by_mail.pdfIn PDF document text
    • http://zidujut.22web.org/vabesixuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxumisi/KIGilgf/wwe_raw_2020_live.pdfIn PDF document text
    • http://bodipok.getenjoyment.net/60181535601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_78dce848e1864cd69337273d2f0f7fa2.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_4b6553ad07e541c9a7177a2600583b0a.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_26b304336c574a83a6612300e375880a.pdf?index=trueIn PDF document text
    • http://bezekibep.epizy.com/printing_company_profile_design_download.pdfIn PDF document text
    • http://gexaforagugozen.rf.gd/zibiw.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_d0055ad461634eed86ba40987ec84b3c.pdf?index=trueIn PDF document text
    • http://lupibewexuzu.rf.gd/rikomosufa.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_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 5352 bytes
SHA-256: d8e8a7eb458765744cd84becfd887fc4e875503dc3fa013aa73f7a60e37bf98e
font_01_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 11016 bytes
SHA-256: f9cbe1a5c4c62f20c749f3da0a83d444b5bf373360d054ff78b1d5bface5a4cb

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