Malicious PDF — malware analysis report

Static analysis result for SHA-256 266858f171eebcd7…

MALICIOUS

PDF

92.8 KB Created: 2021-10-06 14:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 016b2c7905d33de7189fae76ab62c8e3 SHA-1: 865fa29d1605d3d03ac41e95e263b25c84b86b3d SHA-256: 266858f171eebcd785a89033a9592e321c248d45ade418ee9d7d23b2b02aafa2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm. The PDF structure and embedded content suggest it is designed to redirect users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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://priscar.com/documents/files/59285496420.pdf In PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/25831912741.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/79763080480.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/getezonobukokurubomi.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/zigelopuwodumaro.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea88664b80---wefovirixizuwabe.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/41778507667.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/suxerikosesipipixogilane.pdfIn PDF document text
    • http://renknh.com/ckupload/files/maxaxokumusenurof.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/31258763403.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/82901951442.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/64788015318.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///zufixorud.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/40691417840.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/sotelotob.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/18102915664.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/2707695802.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/11b405466a98e7de514c604604fba1d0/43292838064.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/vutiladerufegiluzawimep.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/fadezule.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/75077913787.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/62492382930.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fujifobojuzanonodokog.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/doxizivazub.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/32464787673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=diskpart+convert+gpt+to+mbrPDF link annotation
    • 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_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 10972 bytes
SHA-256: 136a9f32643212b615c51fa756079fd71b9d6d2f400e79e0b060ded781b64230
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 19272 bytes
SHA-256: 984c8ad922e445aa6646a39f7923550b9428c02aa4bf6f33f682dfb0110067fc