Malicious PDF — malware analysis report

Static analysis result for SHA-256 468777d7c536d9bf…

MALICIOUS

PDF

91.2 KB Created: 2021-09-21 01:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b1d7e851fea250dfa9b38a778b78bab9 SHA-1: cea4bb95ba499ad5fad62bfa262e25b23d88ae7e SHA-256: 468777d7c536d9bff5ca89cce2ec49b0cf9d7e7ba0629cd4afe2d6f7c8733cbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://igabana.com/upfolder/e/files/20210912234815.pdf In PDF document text
    • https://pabxlg.com/userfiles/file/xadejisupamiz.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/pedemo.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/12037442471.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/sodimi.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/gabewepejizum.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210913_150315_126.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/wakodutenixarovaro.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/zetepigisava.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/66896712593.pdfIn PDF document text
    • http://hzqzg.com/d/files/wupekalavu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8kvllempe8ir4mjsd16cu0s3b2/65010644909.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/kotoxapawowaf.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/73848221107.pdfIn PDF document text
    • https://mauspro.net/upload/files/75493158590.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/31544775552.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/36646916042.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/wizizurirakin.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/virosavuginugipubemebub.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/ribewewogisepid.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312ec8c7c33---pafexuzu.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/nudeki.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631471294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ver+pantalla+android+en+tv+por+usbPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 19812 bytes
SHA-256: 2eb52ab9d5e2f30dd0025313969eee0a2e3db575b44dedbe3a83b4534748e79c
font_01_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 10660 bytes
SHA-256: 77b31f4483f2ff8244fd0be56e419cdc3b4c14533bec1498e15f9b2e2399e892
font_02_sfnt_off0001452e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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