Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cf16d5e8370672…

MALICIOUS

PDF

81.6 KB Created: 2021-02-15 15:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: a781f7ab499aaded29e6277f5a64dcce SHA-1: 74d450e6de8246dd87761b86bb0fdc7f1420e53f SHA-256: 53cf16d5e8370672a9a0f86239b882275f2772ae1b32c47df808717b4bb8d860
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=prentice+hall+african+american+history+powerpoints In PDF document text
    • http://study-english-05.site/jekejixisinilesisefln81t.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/dghX0if/64264995699.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajura/ojfgcqb/ffbe_war_of_the_visions_your_character_builds.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/ajjbhaE/41287996809.pdfIn PDF document text
    • http://taxiditugivubed.iblogger.org/atherosclerosis_formation_usmle.pdfIn PDF document text
    • https://voromelub.weebly.com/uploads/1/3/4/8/134872571/wibobojakiguzuxumiw.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/djhmiaa/dragon_warrior_nes.pdfIn PDF document text
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/3895764.pdfIn PDF document text
    • https://zafatuxowusetex.weebly.com/uploads/1/3/0/7/130739053/tabujapogel-jaxedozusi-giwizexawesaj.pdfIn PDF document text
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/barovokesu.pdfIn PDF document text
    • http://lesantyqas.online/fegisitowixetujrlhgu.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/7040105.pdfIn PDF document text
    • https://cdn.sqhk.co/wusirilunoko/bigShjW/4885118259.pdfIn PDF document text
    • http://ig-copyrightnotice.com/convert_inches_to_feet_worksheetraitj.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/my_excitel_app.pdfIn PDF document text
    • http://wirelosine.22web.org/68349725793.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezajeb.epizy.com/elapsed_time_with_clocks_worksheets_3rd_grade.pdfIn PDF document text
    • http://xuwixevuje.rf.gd/nivamogabikile.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_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 5448 bytes
SHA-256: b8e4d7b5e02bf72b4f5e66e86e82d2d788e1fdc9e85b5c9b6d7e09b5dbe605d0
font_01_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 14012 bytes
SHA-256: bbb89cf9e5d9b9f368e974a20fffbb87da0a8f57b8eeb09c0cc093f6c961f7fe

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