Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ab37a2548d26f8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 21:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c2aa02fd9fd087fa23e0ccaa9f1c3a7 SHA-1: 398e99bb3af8d4500195359eee6aa92ca9e2d851 SHA-256: 87ab37a2548d26f85756a3061143308724fb3f09b43e5b3cb4fbad878b99f995
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are structured as link farms with UTM parameters, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=best+movies+mod+apk PDF link annotation
    • http://artetendasud.it/userfiles/files/11071354918.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303e907f944---98811536245.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/naxesomozalotelerazem.pdfIn PDF document text
    • https://promise-land.com/upload/file/18150470579.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vpjipp2uf41qoft0dh33u2hlq2/13643632626.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/wenoxewologevaxesitizulus.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/88781974224.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/jugutinupowotefixabimu.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/17783800608.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/rasokokeforanuni.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/99492157028.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/62589932599.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/4956715892.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/8261920864.pdfIn PDF document text
    • http://irths.com/upload_files/files/4410541473.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/16727242652.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/4470765683.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/delogimekeratep.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/dokozisuvexe.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/dilujitax.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/mebeforifugis.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/nabisinuwofonusosijozag.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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 10516 bytes
SHA-256: 1daf9cc2220defae03bfe115977c446f49942ee74caf9a70ff06cee6b8b0ce5a
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 17944 bytes
SHA-256: 74f337c7f37b7130c17a810db81a3ea1006f9bc8551d30cfdd27e5569dbe156a

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