Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a804a8224118770…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 12:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 08596775e6647a3ce86a045033856709 SHA-1: ac0fae81c1af984e7df658e922878de6a3e55471 SHA-256: 0a804a82241187704333010984c5f39bfb8a6b12230aa14c29f81bf97f2c4b08
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=inoty+ios+14+apk PDF link annotation
    • http://www.sun-green.eu/ckfinder/userfiles/files/mofejonarawef.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/xodovadigomekojusogemid.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/korijeneragefona.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/vuxinexodu.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/vumizaguzuzizorevedixisew.pdfIn PDF document text
    • http://santehnika34.ru/images/file/77074124927.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/95455971642.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219839544844.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/bisurevuba.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/dozoluviborupakowase.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/40328819169.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210909_7CED0ED7D4234DC5.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/ragiwi.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/77487929039.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/tidesobidozoxizodo.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/ed78253596d94bb1e4636fd0526725cc.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/23445105430.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/wizalefidasaxu.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631241883JqmN.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/94045352910.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/15618029027.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/meladevesusuvis.pdfIn PDF document text
    • http://esipro.be/userfiles/file/futopuwinopim.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/74670480059.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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10256 bytes
SHA-256: cb43ee2783cf92aaca15d568762de1ee679108807d32f12d35d9eac0788a8443
font_02_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 21340 bytes
SHA-256: 6f92b25b3f83e70508a84432122b61204ac3babf475443fcc6700df2902e9e4c

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