Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb737996a9aa6d5…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 11:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0f745489928e2a7f739ee81d353283ea SHA-1: 7010f2d30d51f4bce84b83d897eeb1df284ffd97 SHA-256: 9cb737996a9aa6d5d7b54af637f690597f282127527681863d7400a8f7b76c59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. No scripts were extracted from this sample, but the presence of numerous external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=sufna+full+movie+watch+online+free PDF link annotation
    • http://kaymccarthy.com/immagini/file/38407535817.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebb9e9f731---pipafuzonurojuz.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/63192102313.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/mesizeji.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/35835953068.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210917121546.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/90227077348.pdfIn PDF document text
    • https://forumsevens.com/images/file/titox.pdfIn PDF document text
    • http://husplaza.hu/editor_up/93946325719.pdfIn PDF document text
    • http://potlista.com/file/files/57471306246.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/suwufolixeruzaxup.pdfIn PDF document text
    • https://chimrodistribution.ro/poze_diverse/file/14826391949.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/pakulotitujojozejibunem.pdfIn PDF document text
    • http://getem.eu/files/file/vuvepefoxuzapebarixebo.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/xijagakusow.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/28478564171.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/74856028292.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/84208092701.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/gatufos.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/mumuxodolob.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/runalovelewupomomafuxidon.pdfIn PDF document text
    • http://ingore.cn/upload/files/33726080788.pdfIn PDF document text
    • https://linardi.ru/files/file/60626569880.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/fanovadudenuv.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/77796557085.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_off0000b024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB024 10760 bytes
SHA-256: d2d8278b06e72f6f652de6e56c62e9d2fdda173edc24ae9762eadb468c71971d
font_01_sfnt_off0000c8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BE 15880 bytes
SHA-256: 422e4ae5d4fee05e8cd3463e0d977c779d7b050fcde403a81144e5a66b42bb7f
font_02_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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