Malicious PDF — malware analysis report

Static analysis result for SHA-256 901a8b2229f7666e…

MALICIOUS

PDF

91.8 KB Created: 2021-09-09 12:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2b1de0e2c56136a104aad7134f47dd7c SHA-1: f2215f9ee5d81a41e860de5024a63d03ad25add5 SHA-256: 901a8b2229f7666e25c9ec7675f7773cafe06c393a1bf9268de3e37d8d80a4ef
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 0.9913

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://allytemp.ru/uplcv?utm_term=how+to+draw+fruits PDF link annotation
    • https://tranhtreo.com/images/ckeditor/files/sunixa.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/ranawelusizotasim.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/pawirukizoja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98f2c61a0---vapiwaxade.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/87063179404.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/xoparagof.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/birofedovavibisodiwilerim.pdfIn PDF document text
    • http://www.centralperdana.com/file/15836876164.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/ziwet.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/tigatik.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/wuramigekosajigiluvowopo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4ba51933---pavesiligorabare.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/91419020171.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/ziwaxetumus.pdfIn PDF document text
    • https://matrixx.lu/images/27409060296.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/81355711666.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/3390209637.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/14770705503.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/jokaxutexokod.pdfIn PDF document text
    • http://mc-opony.pl/files/file/xabobow.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/bawekiwamewilu.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/20968998643.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/pepesanuteduv.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/tasozizi.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/13482942451.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/faguweje.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 10240 bytes
SHA-256: 7c19a3a2f21feee06be143454106e0d18482dada008a67d11ec493077c403dd5
font_01_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 18192 bytes
SHA-256: 017db31178c5398f35c72f65856b05bf79733a8f07f72ad8fec01a1b063f7b3b

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