Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bd7902e80f967c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 13:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b462659dae8015f32f1c3e39620fc0f5 SHA-1: edfd11c48e21bc23497427523380d1cd481d8e9f SHA-256: 86bd7902e80f967c389eeb703e3d835521b3d07ff58c6d3481f68fd899470fe6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and ML classifiers. It contains numerous external URIs, including one pointing to 'inwebjor.ru', suggesting a phishing or redirection attempt. The PDF structure also indicates it's part of a link farm on disposable hosting, further supporting a malicious intent to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=after+we+collided+2020+movie+online PDF link annotation
    • http://vaness-sens.fr/ckfinder/userfiles/files/futogojifozatajomup.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/48096494182.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/6349519179.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/buluxadumuxoserubaba.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sjunpqhm4jpqs301c4ne2opu2s/sasonetuwetuvavepimujuz.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/22018953915.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/rugisedi.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/89954008296.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/90783790211.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/80452771791.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/14855648016.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/6960842121.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/wovonebenemunegonafar.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/79335502035.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109052110585779.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/gofilomekebifetat.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/48333249918.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/41359648279.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/30224335885.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/13137261384.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/peterakewikemiguvazi.pdfIn PDF document text
    • http://3asoft.vn/img/files/kidomor.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/zigexowenepef.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/bafogavoviwolij.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bab8d4b2ee---51690054588.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_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 10684 bytes
SHA-256: e03b570f782e47ce23ed14e58cda87b11cad8b4ae83b18541bd620491435dfc8
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 17232 bytes
SHA-256: e62b8ac814bc93b5e2aada5b8f82f11d37cea5a8e5dc15f1f152e6cb2b20ca36