Malicious PDF — malware analysis report

Static analysis result for SHA-256 7423ecbc55baf73a…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 14:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: f210051f2ff5d801830ef01b240b44dd SHA-1: 760e3b447621e864b0e6e0fcc396832e6017d7d1 SHA-256: 7423ecbc55baf73a00c414cd9c63341b4da6c6753f4fc28683e97080775a97bb
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=soft+computing+textbook+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423700/normal_6028c66fe307d.pdfIn PDF document text
    • http://vas-rem.ru/relenosugetepodixekod0tw6h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_6028668f66355.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/benipokuwazodulinuworodet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481069/normal_5ff2cbc83f70d.pdfIn PDF document text
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/9808f5a.pdfIn PDF document text
    • http://wexuxeretul.22web.org/nakidifikejobozojuduvego.pdfIn PDF document text
    • http://leaninrzpd.site/form_a_sentence_using_calculater5fxk.pdfIn PDF document text
    • http://dabobez.22web.org/optiplex_gx620_chipset_drivers.pdfIn PDF document text
    • http://munupozazuwo.iblogger.org/divikiboke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414691/normal_6016c4a732b09.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/nifoneva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewebuguv.epizy.com/27597399914.pdfIn PDF document text
    • http://jirozeb.epizy.com/gavapotinaxitaxiware.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 5332 bytes
SHA-256: 5cb4cd700c0336fe5962b8060326dcf2ac80fa8154c09077d01d1f2dcacb56de
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 10280 bytes
SHA-256: 787f558b712df29b8bec3579ec0939af182e9243bddc552f6016c90dd4f39853