Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9043b9c733b318…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 00:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56a3dd7bc2aa75e2b8ff7d907eb2f296 SHA-1: 8b5707d071f69b60994b081b69fbdaa1706b5958 SHA-256: af9043b9c733b31833631dbacab735342702ffdfd188be02a0a1fac1049d92cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=piki+show+apk PDF link annotation
    • http://ladispensadicampagna.it/uploads/assets/file/karudevasutodop.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/40469653670.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/dajawijututojalokum.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/fanovobexewewukumig.pdfIn PDF document text
    • https://onlinendttraining.net/files/fuvaresidufudajonevut.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/fokajejorazimexatanokakij.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/sobefajexejogutisuzak.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/50435403815.pdfIn PDF document text
    • http://happy-land.hu/editor_up/67091054989.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/levedogofanake.pdfIn PDF document text
    • http://myhoteltrip.com/userfiles/file/71432790002.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/76763439499.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/favuzabamoz.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/91366027544.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/semarukod.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/zorexagiwusalet.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/betimulapimalapovu.pdfIn PDF document text
    • https://viceda.com/userfiles/file/65077336362.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/89716658249.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/fisorigozubisazulikes.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/47842440813.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/tanemuganekikujisof.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/negolaxoxivexatirewu.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_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 10048 bytes
SHA-256: cfea40595b8c65fad3a8288295356e16f1bcedc3446f9dbee1d5cb67de6419a8
font_02_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 17844 bytes
SHA-256: 1d6d9d257973e46971325ed07a4776ed49945a9be97ae71f234be20155a8fc74

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