Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c4d8a465a33b0f…

MALICIOUS

PDF

64.0 KB Created: 2021-02-15 13:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 5f34010eb4d76d1089cdb4af73de88ff SHA-1: 474088b6e218b652ad42ea0006efa961a9661740 SHA-256: f8c4d8a465a33b0f2f23bdd330e76876c3c79e098cc1a1dcdb959263cf65f2ec
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://yafferge.ru/wix?keyword=holt+mcdougal+larson+pre+algebra+workbook+answers In PDF document text
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/waduw_nonatunuzasi_fapira_zasajilopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406216/normal_5fcc1ada1357e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448985/normal_5fe277ab114a1.pdfIn PDF document text
    • https://bowolaje.weebly.com/uploads/1/3/1/6/131636675/xufefe_gaxaxagize_widobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464302/normal_602492d35ae99.pdfIn PDF document text
    • http://kabonuwumew.66ghz.com/rekakusadidelakopusisen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foripoj.epizy.com/zugegelosesiveronarenisi.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/pawemonozulaxisafobut.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/38942770009.pdfIn PDF document text
    • http://naditoliwinudev.epizy.com/galciv_3_intrigue_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/fexipulu.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/43846932464.pdfIn PDF document text
    • http://juwebud.epizy.com/wrong_turn_2_movie_in_tamilyogi.pdfIn PDF document text
    • http://rumejumobu.epizy.com/birthday_bash_song_pagalworld_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/enable_cookies_android_webview.pdfIn PDF document text
    • http://xavimew.rf.gd/envision_math_grade_1.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_off0000beeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEB 5652 bytes
SHA-256: d15d368be2c3d1a9048348a5181cc1530903fabbbe3901a48ce72da4016ac20a
font_01_sfnt_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 9480 bytes
SHA-256: 5be0e3e9435bdf515bfa1b75631b0d08d7aed5cacbc3e3957bda7ebdeb37d611