Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b4670d38109cd3…

MALICIOUS

PDF

83.8 KB Created: 2021-03-28 02:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d6bc162053081b77b71ffed2131d8e79 SHA-1: 37c2e98efae70410baf671a70c132b2b9e000c99 SHA-256: 23b4670d38109cd34bb53dca506fc31b0954358d57cd0aa92d0acbcbe0aedb9f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of embedded URLs and the link farm heuristic point towards an attack pattern focused on redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=bsc+nursing+entrance+exam+form+fees PDF link annotation
    • http://zuvatewovu.scienceontheweb.net/kindergarten_math_worksheets_free_printable.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/sitezunosobarani.pdfIn PDF document text
    • http://help-igcopyright.xyz/kokesamunifeltkgl8.pdfIn PDF document text
    • https://witirasa.weebly.com/uploads/1/3/4/5/134525236/fuzapabo.pdfIn PDF document text
    • http://recepty-dd.info/35129971053we8s3.pdfIn PDF document text
    • https://zuxevuzefadum.weebly.com/uploads/1/3/0/7/130775429/vetimanexawur.pdfIn PDF document text
    • http://wiinorama.website/74179479713f8j3d.pdfIn PDF document text
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/rasejabawopititozo.pdfIn PDF document text
    • https://rorenaziva.weebly.com/uploads/1/3/1/8/131871817/fcd424e8.pdfIn PDF document text
    • https://fikomepa.weebly.com/uploads/1/3/5/2/135299400/1433423.pdfIn PDF document text
    • http://monoga.space/planets_with_moons_in_the_solar_systemdbedb.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/6352106.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/e3d8e4784.pdfIn PDF document text
    • https://fevupadijedip.weebly.com/uploads/1/3/1/4/131407665/juvofud-rukuwugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/zunureromosikuvaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd4d78f-33c5-4c5a-9e3e-08dd95a2abfb/61669012647.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/vodose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0dd0ec-e8e1-4bff-ad51-17060629a4e7/basizodedogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6052b5c-c730-4474-aa16-534b1c0d6ba1/negamokumavizekipovaw.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/java_8_jdk_windows_7.pdfIn PDF document text
    • http://vujadexofon.atwebpages.com/fubetavowufovugupugir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b052ff62-cfaa-46e5-8011-f53830bde0db/canon_eos_rebel_t5i_charger.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/rawinafurewujunololu.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/fojixuwizab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3898d1bc-b540-4010-b0f6-94b3f688cb05/how_do_i_set_the_time_on_my_g_shock_5522.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_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 5288 bytes
SHA-256: 917dca570878591b5613b8354a38dec19426cf1764ebf86d7393bd8e0c628ffd
font_01_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 10696 bytes
SHA-256: f94d1fda6184aa161de5b1197addc7165e4a18fcfb6d31f6afdb549b43e00b90

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