Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b837beef8062578…

MALICIOUS

PDF

74.0 KB Created: 2021-09-12 05:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 10d1feb40ab5c262cfe5294e9c0612d9 SHA-1: ccbc47b83bb4c3e7e939fa1085cc0f028154b656 SHA-256: 4b837beef806257851bd7ddef70b0a6fa2843b3efa3d5766c9b519905525777f
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 0.9985

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 http://anael.fr/fckeditor/userfiles/file/49765524765.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ab61766b27830a13d548260c9f6ef594/13116176641.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/tebabenosinurud.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f296cd7a---71783975404.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/84807963037.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/nagexufebisawepu.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/15184588221.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/xamavakebava.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/65923277270.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/tolirumezibojisiwogigusu.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/19015238509.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/17786561081.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/30985232442.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/22762515622.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/ruzekowa.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/nidunapujagoxomanukerimur.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/giwokifugogategeteseku.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/75257427966.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/pawaxepawibavosamebaga.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/70572781960.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210901_E6226287307E4D62.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=alternative+app+for+pikashowPDF link annotation
    • 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 8

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_off0000bf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF16 10680 bytes
SHA-256: cbc9fe7677bf1a4786bf65b447080c1bae36b885b2dc06f09e64f3553f466011
font_01_sfnt_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 16676 bytes
SHA-256: f5d0436573573fd4b6f24aea849df9d0be34d87d75edde20b4dbbd4b581e92c6
font_02_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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