Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47ec4181f6ff0cc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 21:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 932c772744c3198733b0bfc306538141 SHA-1: 6a99167e4871f347a700eb7a1254752398e884b1 SHA-256: a47ec4181f6ff0cc46dffaa112c6db3f794c375f84b4d20d635445b952bd2c05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=photo+markup+android PDF link annotation
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nojowalud.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/13364914932.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/gesepobajabamenezezovisu.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/tadasijajupolezosuwim.pdfIn PDF document text
    • https://medpressa.ru/files/file/marowafu.pdfIn PDF document text
    • https://chv.vn/userfiles/file/zexajuzakijaki.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5c62756290b9cebb3efc832e8e191fc6/96967495944.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/69403428900.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1547ed30---10247847239.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/masesoloxeve.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/leraluwam.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/kigolefimesuvamasewok.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/72699121840.pdfIn PDF document text
    • http://mp-journal.com/media/file/63459575311.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/24650841066.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/66666870866.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210909161135.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/refet.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/dumekuwivipozowenodisugus.pdfIn PDF document text
    • https://aromamarketing.md/img/files/dofakagofaxosemi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sexujonazexa.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_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 19860 bytes
SHA-256: e0583a42bbb7dcc78159d8a7b9383d69a60e348973018bd2a4d2b3b94a40a375
font_01_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 10504 bytes
SHA-256: 0fbd23008611d825f1f8d90bdbb5839c057d8fb8e5f2eea3966770b8659dd2b0

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