Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f34ef0329de600…

MALICIOUS

PDF

64.0 KB Created: 2021-09-17 22:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 941867a9de7c772c0cb1cafc763d290c SHA-1: cf10c42c9ca7e196392a6dc2e0568cc335bbf7be SHA-256: a9f34ef0329de60043bf2bf4331b8342dc4094fbaa05afea5ddc83be5e05ca91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm on disposable hosting, with many links pointing to other PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the nature of the PDF structure point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://pixomot.ru/uplcv?utm_term=hungerford+algebra+pdf PDF link annotation
    • https://cytairtool.com/test/userfiles/file/20210912_e69be.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/suromutilusetob.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/74615542394.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/59533026837.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/80081581286.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/13042968637.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/36532744649.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/14410304180.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/87591327039.pdfIn PDF document text
    • https://fptica.ru/images/file/riwanizuwowukogipi.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/84220916758.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/11524489369.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/51987047218.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/tajeribixubetaxibovo.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907174927639252.pdfIn PDF document text
    • http://prestopc.it/upload/file/pitoloroguxutevib.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/94525311868.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/pagifopofumikalera.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/4126929220.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/towozeb.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210908060816.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/zuzajoxalajigejapo.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/45329577248.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c2f580e90---lukamipel.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.