Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32b8a29457b78e7…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 07:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e95ea875b3e6d01cc8e45af532595ef0 SHA-1: a607cae77771dbc6e246be08b12dba8c13e00375 SHA-256: e32b8a29457b78e7621685554ae77737243bfeb2d3de1bdffbe009cb2eee5942
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://officialbacknumber.org/editor_up/kerowizigo.pdf In PDF document text
    • http://idcla.net/upload/files/rerama.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/busewod.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/6739518326.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/kuruzawepebuz.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/zaron.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/25201918004.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/23645569506.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/sezevifomokafuda.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/guledurad.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/99595690958.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/190298233.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161325b6272189---nukomegefovetepipuwujut.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150dc7f0b99c---52601612853.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/48691220441.pdfIn PDF document text
    • https://panama4d.com/contents/files/55612761861.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/sisew.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/vadilaxozefoxivu.pdfIn PDF document text
    • http://naso10.com/userData/board/file/fogemuwag.pdfIn PDF document text
    • https://luminex.pl/upload/file/foxitekiwibivezuse.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamixuni.pdfIn PDF document text
    • https://geniodelweb.com/file/73910378086.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/47534572691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=play+store+download+apk+pcPDF 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_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 10708 bytes
SHA-256: 022da8ca04f69339e1348af23ccefe4d0c01c21e80e1b8b7d190a13ddfcc63ee
font_01_sfnt_off0000cab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB7 15484 bytes
SHA-256: f4b352d74eb0a3faffb17536613a7bdfa9cb934cfe53b11537d3177df9ee5e9f
font_02_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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