Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dabbd309be4bd84…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 20:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2411219e9d0673380ee3ce4555344641 SHA-1: b77e0be5570a348357bee9fe1f162b5b24896dc6 SHA-256: 7dabbd309be4bd84c185398036f08cc0ffe3c61b28c166d4ed270413be0bd634
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to direct users to potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=call+history+any+number+details+mod+apk+free+download PDF link annotation
    • https://wilocom.ro/ckfinder/userfiles/files/3815714066.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/71101627586.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0b239d9b9381a08e376974f9ec6f2435/83316504574.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/38570134911.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/20568708962.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/83410544097.pdfIn PDF document text
    • http://dolonchem.com/upload/files/13964633175.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/kupexujasipiwajuberekozej.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/keserokirukokeda.pdfIn PDF document text
    • http://boldogelet.hu/media/jebowafazemibareta.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/virekesori.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/13202157377.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e8566cad---sowokuwuzinagosuda.pdfIn PDF document text
    • https://mahae.hu/files/files/momakobevarujug.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/28490297928.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/73918155074.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/vobezoriwiwidewuxes.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/nuvidutiporuwatexodagasa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jisopofito.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109081658024812.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/tusokosuzebugufele.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/70604594102.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/vapotedibunopixomos.pdfIn PDF document text
    • https://cowik.pl/upload/97292292968.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_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 11328 bytes
SHA-256: 0b8d327a41aa72fa84299d0d19d0fb9d693f003b5bfa36e4ac663625a39dbda6
font_02_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 18128 bytes
SHA-256: 4652a11f82a77dec8fc14d26f18fbb907d43bbb39982848bd865e0890d933684

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