Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f057a72c117fd5…

MALICIOUS

PDF

69.2 KB Created: 2021-02-25 19:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: e487e55556f9c4889a19dfdc3b5cddd9 SHA-1: 9c8b4b8f95ce2d255027eb3809db3ce6fcce1129 SHA-256: 81f057a72c117fd5b3187d9ba57a9f3034ce60e190643c01c6e7fe4ec9318181
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/award?keyword=dungeons+and+dragons+core+rulebooks In PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/8765479.pdfIn PDF document text
    • http://mastericy-chistoty.ru/subject_verb_agreement_practice_answersub2b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_60354b0c14714.pdfIn PDF document text
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/2467563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_603352a37bfb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fce97bf6481d.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/zitamipi.pdfIn PDF document text
    • https://wezusutuxalik.weebly.com/uploads/1/3/1/6/131637092/xegipekoveka.pdfIn PDF document text
    • https://noxijinijomud.weebly.com/uploads/1/3/4/7/134746703/povemuzesibagidoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_5fd24c5ae31da.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/samsung_xpress_c460fw_driver.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/what_is_social_construction_of_reality_theory.pdfIn PDF document text
    • https://rifewageza.weebly.com/uploads/1/3/5/3/135349229/mojatoxuge.pdfIn PDF document text
    • http://miiliioner.xyz/prefixos_e_sufixos_em_inglesufb39.pdfIn PDF document text
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/kikizotitoduri.pdfIn PDF document text
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/lafowav-gujirezalekole-vufoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/angielski_w_tumaczeniach_4.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/atapi_cd_dvd_rom_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/80525027009.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/nururorafizeduvapope.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/development_reporting_in_journalism.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_off0000d05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 5308 bytes
SHA-256: a1d57125ef5539d3d7a4fe794fcfd6bf7ca2844c79d11f505985f34fa6f29c74
font_01_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 10892 bytes
SHA-256: 6988c41abe10fe9ec78e3f23bfce0825c00ab614b67068c212327f6c8598182b