Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4c16095c35b74e…

MALICIOUS

PDF

72.7 KB Created: 2021-02-23 22:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: ffa3fbaa00a418f108e43a481a4740f8 SHA-1: 1b8e8c9a12e5aa23c352ed01a5aa25e94d1841aa SHA-256: 3b4c16095c35b74e0b17a269820c598379327e1176d3a9cd00b82244c6b259af
194 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=work+and+power+worksheet+answer+key+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5ffc90cd6eeac.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/SRMcu5y/codigo_procesal_civil_y_mercantil_de_el_salvador.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5fcd1c2d6c390.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/gcBXihh/gamefly_coupon_august_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486374/normal_600d8b545d638.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486374/normal_5fc7fdf5a62d9.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/hGibGfL/taletizurulerusevitaguxe.pdfIn PDF document text
    • http://dihtyar.online/education_board_2019_marksheetltr6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379720/normal_5ff8163b35abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366008/normal_5fc7267825c0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387716/normal_5fe1c9ca20631.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/iuoij1L/64027364611.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/legesiliv/zavipurogosodewimedani.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/manualidades_navideas_faciles_de_hacer_y_economicas.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/jexogizo.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/zerepedefowaxiz.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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 5368 bytes
SHA-256: 9bb21cb98340087155c42e7f97c01b29553822de7389cc0fce44d5a257735e0c
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10380 bytes
SHA-256: 3135377a0de099491723e5b22ad70209237ff691c9137fd7647aad5cac67e83d