Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4999a35dd9e0d6d…

MALICIOUS

PDF

73.6 KB Created: 2021-03-28 17:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1c5fcfb7c4368f468650f998e1f37c86 SHA-1: 5462ce1ba18058b797d8c563d5c23dc46b1ed493 SHA-256: f4999a35dd9e0d6d67523da912fefce23ddf163c857581deb4331c27dbb0b8a2
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://fokemale.ru/award?keyword=alternatives+%25C3%25A9conomiques+reussir+son+bac+es+pdf PDF link annotation
    • http://takipibimaxubov.sportsontheweb.net/sickle_cell_disease.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/1cd04e23c.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/6120308780.pdfIn PDF document text
    • http://mibikazut.mypressonline.com/87468788610.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/7253744.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/bond_market_performance_history.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/bawofikisamikilob.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/dgihagj/26768205651.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/bsc_agriculture_1st_year_syllabus_2020.pdfIn PDF document text
    • https://kemovovem.weebly.com/uploads/1/3/1/4/131408999/fomaxo_wewepewoj_motukudetaxoni.pdfIn PDF document text
    • http://paruxezogu.mygamesonline.org/backward_design_lesson_plan_template.pdfIn PDF document text
    • http://fuxutigox.mypressonline.com/liwoxolo.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/pofilolupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_aa4870f10fa748d48f2f1e1c05092dce.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_385b914fe87a4496919308c7e9dd3585.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_7094c6536eb146ff9473e9fd7e0214d6.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_87ed4f21855f48a29928cbafad19b882.pdf?index=trueIn 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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 5756 bytes
SHA-256: c675e1d44d768e8cc1bfcc196f69a42c458aa7fc493910fcf66c3a16e3ceb711
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 12208 bytes
SHA-256: 76e9f46daa1d47d434186da45b6352159dbce2f1f4f900afc166fe9776ccb5d1

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