Malicious PDF — malware analysis report

Static analysis result for SHA-256 99713075c644887e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 23:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b16a6f71e34482a8847f23309d392f44 SHA-1: 1500e07d07a8c00f1bdd541bd8ddcbae6556d761 SHA-256: 99713075c644887e089597690dcc263b85580117abd966c47973d6ca892707bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of external URIs and the overall structure strongly indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=ewallet+cloud+sync+android PDF link annotation
    • https://oancora.com/ckfinder/files/38160291350.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/76908812382.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210910_59F251F7B96A25AF.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/fajasofew.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/gimizupozuvomap.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/jabisalukobuzokimonizor.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/zinerimag.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109031644465449.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/38610334973.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/98691891746.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/pusurawijukeko.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/67037790154.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/38176990263.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/41905122180.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/20800613910.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/zujoraxixesifobeb.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/85234770080.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93480777590.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091007470873499.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109041757414073.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613254ab53bf1---67241590384.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/zafabobekalisesujugobewe.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/lebijenobikijuxamovadabe.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/38957144997.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_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 18220 bytes
SHA-256: 585814f7af27c83c4c6709573f0fb806132a2231433cec084a4323795a8eb9fa
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 10644 bytes
SHA-256: 27fa82d15077789c0a783238e79dead8825e60de5849c2506f5ed334f85b217b
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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