Malicious PDF — malware analysis report

Static analysis result for SHA-256 80daf7695aa35bdc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 16:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b063f9c488144978f690792e2369b201 SHA-1: 9c06ae428ac14fc6351b85572b97b68e95c107cf SHA-256: 80daf7695aa35bdc9450bcb61e70cbea728fb3a9c6cd3a16d6783df9869ca51f
102 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and the heuristic identifying it as a 'link farm on disposable hosting' strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4596

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.
  • 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
  • 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://crewmak.ru/uplcv?utm_term=top+10+drawing+apps+for+android PDF link annotation
    • https://resttour.com/images/userfiles/files/96647960222.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/58132682627.pdfIn PDF document text
    • https://mediaskills.rs/files/jopizosim.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/gevebikigijalanol.pdfIn PDF document text
    • https://mollis.rs/files/nezizakaxeniledekazojo.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/piginozefegigogukevem.pdfIn PDF document text
    • http://reylab.com/userfiles/file/sivakef.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/95952996473.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/b8fr50iedevshamdn2d95v7872/natora.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/89914398340.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/83950889200.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210910162309_1335954875.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/nipidujukexis.pdfIn PDF document text
    • http://vo23.ru/upload/file/664421163.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/39014779164.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365a035f7b---mijipurewefemo.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/55694728036.pdfIn PDF document text
    • http://ruihuitax.com/files/file/91337225953.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/80651148895.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/99373222727.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vomisawumozitekivipulo.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/98882246922.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/duvewusa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10620 bytes
SHA-256: d00c7c733c47fc36e67865d9437b496587ada186d5c15feacbacbb0b5b445e3c

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