Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c395d9fdc757296…

MALICIOUS

PDF

79.8 KB Created: 2021-02-11 23:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e56add41f036556fef7d3285f649ffaf SHA-1: eeacd8f05416f3c2e866ab508a50d5fae90498a7 SHA-256: 9c395d9fdc7572963ad509f9fca96add1575d0fedef6af318278f94b7e4a6780
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a known malicious redirector and others pointing to external PDF files. This behavior is indicative of a link farm or phishing campaign designed to direct users to malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/123?utm_term=crib+changing+table+combo+burlington In PDF document text
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/db9856a207.pdfIn PDF document text
    • http://about-central.com/catan_dice_game_how_to_play3hrlz.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/google_meeting_agenda_template.pdfIn PDF document text
    • http://alluniversity.fun/non_formal_education_definition_sociology9r99u.pdfIn PDF document text
    • http://thedefenseforge.com/lyn_the_lightbringer_rerollxartt.pdfIn PDF document text
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/riwunolunulezig.pdfIn PDF document text
    • https://vetafewilede.weebly.com/uploads/1/3/1/4/131408572/2f6db.pdfIn PDF document text
    • http://blue-tick-central.com/free_christmas_invitation_templatesq0or1.pdfIn PDF document text
    • http://taxiditugivubed.iblogger.org/journal_of_endodontics_author_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kobelitorapojop.rf.gd/fb_video_er_chrome_online.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/9492055070.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/adobe_illustrator_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/joint_maintenance_worksheet_colorado.pdfIn PDF document text
    • http://nezuwuxupewe.rf.gd/29427391902.pdfIn PDF document text
    • http://jenulozamaberur.epizy.com/spider_man_ps4_not_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/nufatalovegulivadofesiw.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/46098832802.pdfIn PDF document text
    • http://wadobenozunon.rf.gd/28169654201.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/34895108088.pdfIn PDF document text
    • http://ditajizuru.rf.gd/superconductivity_bcs_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/sebemobikisefuvev.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_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 5080 bytes
SHA-256: 9170b9790e4260789e13ad1052eb1e1f615af463548c90ab136820aba9b74fe1
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 10656 bytes
SHA-256: 6872dfab1c763c4b9a496602f349c4b3b57ed54c840f7b317b15c811d26fcc74

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