Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfcf69dd3303f44…

MALICIOUS

PDF

65.0 KB Created: 2021-02-24 07:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d18d8a1b7ac5c7bd472ef6f6e984eb1d SHA-1: 93a3a3f55c4895525257c59b152962f373c33755 SHA-256: 4dfcf69dd3303f448421243628d7efd81e68b6b7456c1123b571658ca1c2aadb
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/wix?keyword=dialogue+punctuation+worksheet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5ff4cef2b2e4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fe167d457b0c.pdfIn PDF document text
    • http://scoretdho.best/kirke_madeline_miller2kk88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5ff4c4c3a1fca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://goguvero.epizy.com/the_hidden_persuaders_book_review.pdfIn PDF document text
    • http://mezureda.rf.gd/what_are_the_2_things_needed_for_cellular_respiration.pdfIn PDF document text
    • http://levuvov.epizy.com/conway_twitty_sheet_music.pdfIn PDF document text
    • http://jigufabusu.epizy.com/puvivamajagoriwulerol.pdfIn PDF document text
    • http://vuruketunuwu.epizy.com/wififijetaw.pdfIn PDF document text
    • http://tinijev.epizy.com/iu_palette_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/vowajebitevedejapax.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_off0000c219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC219 5352 bytes
SHA-256: a35e33e4de6f6fede351dd4fe406d426c18d15ad4213cdba3a686cd34f852067
font_01_sfnt_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 10476 bytes
SHA-256: e54cd8e5011e856694eb350a2ea15fc123c5e5b957987e26e20aff3857238a19