Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab0b863a9bbd52f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 08:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 012d4c7905050a5be3d971e0cf742144 SHA-1: 1ebe245a13e46dd34e21e946d3406392645cee4b SHA-256: fab0b863a9bbd52f01fcae777e511448aa59bb18930f1b9ce1372cb10ad391d3
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is part of a network of sites designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=edge+chromium+adblock PDF link annotation
    • http://oldmotorsclub.com/files/file/77913257264.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/wimiledupukojemifukib.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/ratewuj.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/39856183592.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613d83798e693---nebopin.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/55806026167.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/71291126854.pdfIn PDF document text
    • https://combrooncom.com/contents/files/meginotubatekujube.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/1790423457.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/48149898165.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/rujimixumavigifoku.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/dategi.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/1462420810.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/78178072822.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/nuxagixuborud.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/63150829647.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/wuwexarizonugoj.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/zugeguteruwat.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/farinubujo.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/sivenena.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/62929676750.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/97575427816.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_off0000b6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E1 15604 bytes
SHA-256: 1f9b04d126886f292c4664fe5a0331caf6e3bc8c55002b356d18ba6a2fe64a51
font_01_sfnt_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 10760 bytes
SHA-256: f69936776e56a33184d00d560281b4f3b536466fadc51e3ea57e8ff162a7a00c
font_02_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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