Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b904dd0164a6c3…

MALICIOUS

PDF

67.8 KB Created: 2021-02-24 04:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 8b2b7e984e78dc4afb08b8eb9d59d340 SHA-1: fdf67d649102dec4ed35ae4a285bf198cd93053b SHA-256: 21b904dd0164a6c3dbb7a930b1720927ba390fd779e81abbebe833d2bffc50ec
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/wix?keyword=brimstone+pickaxe+wow+8.2 In PDF document text
    • https://cdn.sqhk.co/buzivafulet/jcjcjgY/learn_thai_language_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/2Nt1GGb/zajekuvitoxusigejurusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5ffa396db6326.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/hhchc37/fios_tv_one_remote_not_pairing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501791/normal_5fefd1966f01f.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/jcihzBs/pamox.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/4d3ea4q/67701395086.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/jgidB6B/zitavoxag.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/itUpheN/kafov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_5ff9a56ddf4ce.pdfIn PDF document text
    • http://fridgeservice.ru/romezivetumushcu7w.pdfIn PDF document text
    • http://cardioactiveuficiale.site/27827659853dvum0.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/YggAGYT/boone_first_umc.pdfIn PDF document text
    • http://itdiscounts.info/41582747002rofae.pdfIn PDF document text
    • http://vsedlyatebya.xyz/sumerian_cuneiform_alphabetxe8yj.pdfIn PDF document text
    • http://texno3ua.com/tejore_kamalapati_borgeetta7ip.pdfIn PDF document text
    • http://bestplacefor.rest/5th_grade_math_multiplication_worksheets_printable1hdt7.pdfIn PDF document text
    • http://afracheat5.xyz/mewutu7szip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 5680 bytes
SHA-256: 79f2c47d9e91c9ab4cadc0376a5d71eb4b4d6e559369abe35093e6df5395d3b0
font_01_sfnt_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10004 bytes
SHA-256: 72b8ac52c2d8d93932af8705b0ad06add8bec9a20dc4594e7d03336400af12e5