Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dbdf2b5b5bcbe8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 01:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 944b684d6b2d360b126200771614ab0f SHA-1: 328ddd27c77618c9a2f124a9aee63c2433b5cfc8 SHA-256: d5dbdf2b5b5bcbe8e7e5d57a25d19c6f5f6c37c0d37ef41e751991aa6bec7112
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are algorithmically generated and hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript further supports malicious intent, likely to facilitate the redirection or execution of further malicious content. The ClamAV detection and ML classifier also indicate a high likelihood of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

Heuristics 7

  • 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cructi.ru/uplcv?utm_term=minecraft+1+13.0+9+apk PDF link annotation
    • https://korankertas.com/contents/files/93805887308.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/36937311449.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/36348118930.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109120702303004.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/vumedaradivoxatipovifo.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/78938903542.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/wofabipituziwuladezuvise.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pojiluduvilimajedugoni.pdfIn PDF document text
    • http://edituj.cz/res/file/moxofiboparirixuduj.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/61027430488.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/72154417218.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/wirinus.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/6814275532.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/04ab21cec7eac1721515be4705728e50/45031461557.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/12659633200.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/dalobukekuvasitiboxabolow.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/dafudomivuvo.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/73229344867.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/mukalifedazusakuradi.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/lukavimafapaletejokubu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03751fbc3---57118401663.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/26647944175.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210901085541_sg9ime.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/63290518052.pdfIn 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 17348 bytes
SHA-256: 03a53dedd32c3687df2e375b643ab03ae6c1dac4a4bcfeb89615b64b2a264320
font_01_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 10804 bytes
SHA-256: 93fcacf5f2933388347970f828dcdd320a375df2ad159a50d557f299e8bc3786
font_02_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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