Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6ccf09bf8dccca…

MALICIOUS

PDF

73.5 KB Created: 2021-09-28 06:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8009d356553c3800a85f76c3cbbd6b6c SHA-1: 177fcd1437d3cd6bc28cfc9ca3a3c97d9cbe144d SHA-256: 5c6ccf09bf8dcccabe8e62e4831f05280ae0a296039e7264607a8e1ee8cd2ac8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links point to a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=photo+chupane+ka+apps PDF link annotation
    • http://acelybio.com/upload/files/zofazukimesak.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-10/20210910003131443320.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/80468763541.pdfIn PDF document text
    • https://akconta.com/uploads/files/vinujuwuzomalupobotafok.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/64207338303.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/20618527269.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/nosodefenaso.pdfIn PDF document text
    • https://beaszemin.com/files/votapujulike.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/zagezigalogaj.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/48939331727.pdfIn PDF document text
    • http://wernitznigg.at/files/xoxisevubavafol.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fff1d7dd3---zixijigux.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/zifabawimudevi.pdfIn PDF document text
    • http://schokobrunnen.com/idata/pezemevatevunaxopogap.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16148e6a5a8f20---vufijevinawuxopekimu.pdfIn PDF document text
    • http://packamate.com/userfiles/rojotemajoja.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/tesexamopenenuve.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/75022319549.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/seful.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/bewatirolunepar.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/jozedobetofe.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/rolenipit.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/gidew.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/dumusika.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/wujukunofeloj.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_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 18188 bytes
SHA-256: 3f5e60c427e9d6b52c21788fc591528113f2eb7c244b06c0c0d63e896ed3c110
font_01_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 10428 bytes
SHA-256: ec0555edf6636fd45c8fe3d25ea6ac32e4769e26bf39915fc39861ea267c8a30