Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87b57ff2d280462…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 19:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a77a4d02c40423505bef6c9d626870c SHA-1: 8618a217781aa7fb97d83c685e3bfa38ee61369b SHA-256: f87b57ff2d280462a0eb506a1f6fd3c2740269dd079c00e2ca7ad8857207f594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of these numerous, low-reputation URLs strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=keypad+sound+android PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50dadf4a9---bipenifufetixifilozeda.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/92835908558.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/91393901799.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/56161994394.pdfIn PDF document text
    • http://armanetti.com/images/36359551916.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/virim.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/rebazezufira.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/bovivipitimoponelolu.pdfIn PDF document text
    • http://balone.net/_upload/file///22049048190.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/30959855716.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dibuweri.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16307705878455.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202194232995516.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/guxukizonoxitorolupupafi.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/22220401143.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/sonojomitujawatudujigimus.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210925_095758_190.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343dedaf473---vebesubojaxerawafomokijol.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/44973295962.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/wowigemoxekuf.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210912081337_764980261.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/73552183214.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/vavipatonosefupevined.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/45574559548.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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 10448 bytes
SHA-256: f2acbf7d4dc831c43c12c669722b039ef3e780699bb17cb3f5d9c1b477e93dba
font_02_sfnt_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 17644 bytes
SHA-256: 89b421b8e7a3984dfb4ef300635e0541e0b73fe7e2ed38c408eff7ae62117654

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