Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b122e1ed571bfd3…

MALICIOUS

PDF

68.0 KB Created: 2021-10-03 22:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 953ffa77e877676c8b8f30d8269321ee SHA-1: ebf66a75d25fd93f95573823557d46808b26eba3 SHA-256: 0b122e1ed571bfd3e50a16ab5228c39053b4dafd057fed7713f526e3a10908ac
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious phishing lure due to its image-only nature and a click-outward action, typical of attempts to deceive users. Multiple heuristics and ClamAV detection confirm its malicious classification. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a campaign to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=vocal+warm+ups+for+choirs+pdf PDF link annotation
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/rimevagemese.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/9953826871.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/datopulanemomono.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jesupenudeburupoxaxibazu.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/44116910960.pdfIn PDF document text
    • http://z500.si/files/lasewapobi.pdfIn PDF document text
    • https://cian.hr/userfiles/file/birolotefafubuzeg.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/mamifujarabegumagal.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/11601497606.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/52499811578.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/76003314835.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/21169551519.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/tozaresimajog.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/woxepakavibisezab.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/gofibiwiluxutof.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/75647945706.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/lapubinosafiwe.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/12679787749.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9269defc6---nugezasiwimer.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/ralibukozizega.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/80710847831.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/wimugejavagukarosoz.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/lixazevewili.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_off0000aece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 10704 bytes
SHA-256: df86be1a67471da5b81b42361cf7a599da933f0f810fce14c2c4a57fbfc92103
font_02_sfnt_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 14204 bytes
SHA-256: 1143d25e0468dff2b7d0bb7222cec1a326f43bd1d82eb00f92f40ba5e6032a63