Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76b0395bac686a1…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 00:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95df058a99355f693d617e823924c804 SHA-1: 3f06bc1ec9cf1c5ab38984f69183a40c7e6dfdaa SHA-256: e76b0395bac686a1498f4f85a562cb20b34eff5fcac3927b78fbaf89714fc379
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs pointing to a link farm, with one URL specifically identified as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8207ad942---25841061036.pdf In PDF document text
    • http://slovoveri.org/userfiles/xuvenesu.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/kunaxutubetativapaxife.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/41775487275.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/11877314895.pdfIn PDF document text
    • http://trubaopt.ru/content/file/1750944430.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/7779005911.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/vomubujemavuwezitugovis.pdfIn PDF document text
    • http://aa-nusd.jp/17529511370.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/40256518054.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9b996cc8---jamoxaduvadeginurodavobi.pdfIn PDF document text
    • http://renknh.com/ckupload/files/25427503251.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/wafuzabugamumesep.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/61121848045.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/ninarawijobowoziwijuzinis.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/tarutugegavatabobisuwusow.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/26423961094.pdfIn PDF document text
    • https://signika.pl/Upload/file/51133432477.pdfIn PDF document text
    • https://campermagazine.tv/public/file/41093966567.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/ponod.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/99035385462.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/16025478082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=miui+rom+for+redmi+4aPDF 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_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 18400 bytes
SHA-256: aa7bfc95db4efc5735358a6db6ff0f55caa331b5bc19bb859874999068217656
font_01_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 10268 bytes
SHA-256: 8b1f3a7a21bb4d90e6fb75a4e4ec830bbcc7ca983c206eb7a46da7a3fccbd408

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