Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e4e1c7c7cafb0e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 16:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a8efb4287089e21e4c934f466dceeda SHA-1: b67953f7d42210fb8632031e7f7c1709e97ce559 SHA-256: a1e4e1c7c7cafb0e672ea15ef9bf2d2f002e8f1555e0b49046c5b32f06057ef0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=phantasy+star+zero+ds+rom PDF link annotation
    • https://tanhaithanhvalves.com/quangcao/admin/file/74534921851.pdfIn PDF document text
    • http://hmed.vn/upload/files/ramidapemefifofomiji.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/xurapularevemedixupivonir.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/6994777758.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/winuzeloruli.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/116ad8d8830935b16df00e1836d178e1/zagifexesarak.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/31308336999.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/gobefezorumirupowanopev.pdfIn PDF document text
    • http://rhondachem.com/d/files/87907265249.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/63194616498.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/1541919909.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tufotugoge.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/vitomixiranopewa.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ae7a1eb0---87832659866.pdfIn PDF document text
    • https://medius.sk/userfiles/file/vusoxesagaroruvodomegex.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/kepazikipobagugijej.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/tibalawitevodog.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/xuxifesaregumipenuj.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/52598118401.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/39149856583.pdfIn PDF document text
    • http://htwy.com/upload/file/xigebepezaxafugikamomo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/nowakalinudel.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_off0000b785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 10548 bytes
SHA-256: 1545ca5644f58ff6928b60a476e03d839b6a617813ca7cf343c71ac313c64679
font_02_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 16328 bytes
SHA-256: 1b0d7c2b113d080fbfb26c9ee3edf665e67192f665caaecba7ad773b815602a0

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