Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a421af9288d0793…

MALICIOUS

PDF

82.8 KB Created: 2021-04-22 14:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d9a88e286df3577a1e45de1d35a07801 SHA-1: 5fa551257c413f71383b0c13acbe4e80d28df981 SHA-256: 1a421af9288d0793a57b0c2a7a4c7641861f1beb034132448bd6ac549ebc2a7d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites. Heuristics indicate these links are part of a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' rules. The ML classifier and ClamAV detection further support the malicious nature of this document, likely intended for phishing or malware distribution.

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://dafemum.ru/strik?utm_term=wedgewood+stove+manual+pdf In PDF document text
    • http://pazefezos.mywebcommunity.org/agile_software_project_management_methods.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/tubogibigara.pdfIn PDF document text
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/xapilikevan.pdfIn PDF document text
    • https://vuxorewuv.weebly.com/uploads/1/3/4/8/134861163/3905090.pdfIn PDF document text
    • https://bepewosub.weebly.com/uploads/1/3/4/4/134445398/nejavage-kilusaluj-subabin-bigab.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/kusode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/zipodozuk.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/livef.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/acoustica_mixcraft_4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/utorrent_free_for_mac_10._5.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_18788e8782174e4faa536c1be3dc3723.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_ecccf1072ed54a5c99930b93e9af68b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/destiny_2_guided_games_wait_time.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/power_electronics_international_smart_move_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/78492693408.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/whatsapp_status_songs_in_tamil_video.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/4_digit_addition_worksheets_without_regrouping.pdfIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_939352fccbd44352a1d9b207302a9709.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_58b7f6d887f0485abe45ec2d0c47efa8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/best_holster_for_sig_sauer_1911_tacops.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/drools_feeding_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 5432 bytes
SHA-256: 0d27ccfbd03546b8855ea1d4de75d0c79634bb2d07f26afd9762d2d474ae4715
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 10532 bytes
SHA-256: 2f6442d3b557eec4d15cc1a4531748948eda0e08101dfda4662ba186e97cd572
font_02_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 16068 bytes
SHA-256: 9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6