Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8038c806168e0bf…

MALICIOUS

PDF

64.0 KB Created: 2021-09-20 03:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d40ee1d0d728b863a647ce391e0641a SHA-1: f275b501e7d8ef6ec7ce53637e9ca51046b02e32 SHA-256: a8038c806168e0bf495fd2fd508b2dc005ceadeea30908118c19bd00b8b4ad48
124 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the structure strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5839

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://studiozoppini.com/userfiles/files/torozazaw.pdf In PDF document text
    • http://fjzy18.com/image/uload/files/10103581666.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/22930437561.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/15029332124.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/62279911033.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/85559019375.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/32569067672.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/pabijunikuro.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/lejimawijadujiganofobuxe.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/bazapane.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/famixevezobobiru.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/lonebedevapom.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/danugiguruminanodazim.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/wasetafunotesoruxadiperok.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/83975537111.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c7a91e73---66394219347.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/gubonekeba.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/89945233240.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/gamuwevewowawob.pdfIn PDF document text
    • http://12shio5.com/contents/files/subinewuvo.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/taxinuzej.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/47190182897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+pe+download+free+latest+versionPDF link annotation
    • 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_off0000c4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A1 10760 bytes
SHA-256: 152238b2122bdb4a6efb4c47b583aed88228d1deb161d437e117ce911fd06a0c
font_01_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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