Malicious PDF — malware analysis report

Static analysis result for SHA-256 4586af024563406d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 05:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b135d6590c12e77e9bce5f10d079dcfe SHA-1: 061437ee50b557679362c9fbb77b8a5386609e3a SHA-256: 4586af024563406def1100b32c49786a3928512711032c72cc6a8aa51c8464f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9960

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://nomylo.ru/uplcv?utm_term=betty+azar+understanding+and+using+english+grammar+5th+edition+pdf PDF link annotation
    • http://artstudiodesign.it/userfiles/files/96748849064.pdfIn PDF document text
    • http://gazetavk.ru/img/file/24759543178.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fububudipij.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/44149077580.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/22407449053.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/jupulaluvexeto.pdfIn PDF document text
    • https://turbooto.vn/upload/files/denefebelobag.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/54938839955.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/18929103341.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/ranubabu.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/88021585047.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/jewole.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/48153055827.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/letojepere.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/60631750809.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16137284bc2dec---zonufijuwoburakugoji.pdfIn PDF document text
    • http://onelove.cz/file/21618239362.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/vusebefere.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/86504315525.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xepunoxurabubabopo.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/simifutedaxabezuzonobu.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/gakiwoli.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///92436279874.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 17460 bytes
SHA-256: 2260aa9f05ba4223029def4cf68b1cd6c411149e87025c2c1e75d690a99cb15e
font_01_sfnt_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 11408 bytes
SHA-256: 4a365619be3de7e5a3309db99d6e5bd4e634ebc4cade2305c07cb9a83d09c47c

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