Malicious PDF — malware analysis report

Static analysis result for SHA-256 037ef355aa88587c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 23:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 8f9ceb8afd09effb8e551bcde55a4bee SHA-1: 5d158447a7804eca2d6bd49de8d30bf0f07e7447 SHA-256: 037ef355aa88587ceb374c1db8f2e2087f534661f0091467d02236eab73864ce
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 0.9980

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://samuiluxurytravel.com/Uploads/file/lofosutati.pdf In PDF document text
    • https://powermailer.in/userfiles/file/62890405050.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/6125112338.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/rojaxepalevokolitalorix.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/dipojokudumuliwuso.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e1b0efcf1fd94fd047ce60b1f294765f/kekekufeleb.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/ramokutazikowelokol.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/55254099082.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/10233631716.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/jezusavononiv.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/suzusebufatotokawelezab.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/218af71c59806fecaa551661c60fbebd/16596300684.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/84233004540.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/71975769982.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/9642807264.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/78707924312.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/85277432289.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/42118149055.pdfIn PDF document text
    • http://iviltra.lt/images/files/xodegefupilor.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/lusatuzoxogajobizolid.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/sexilelisope.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/lubisidaburaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cinema+paradiso+online+freePDF 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_off0000bf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF37 10592 bytes
SHA-256: b575834bd8e90ee5616a10956a979dc397b7fd9592be81cd8eacf7b2b07bd077
font_01_sfnt_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 16476 bytes
SHA-256: 5fc966cdccb3e5d82cfe70d0c1431b5705d2d42edb997cc7993891412bf506cc
font_02_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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