Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c19c1ec0956a9bf…

MALICIOUS

PDF

90.6 KB Created: 2021-03-17 18:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4898f2a5d6c029b7755afbdea8d89812 SHA-1: 6e839eb7a0ab11e014063b33dc76c262caf86b36 SHA-256: 6c19c1ec0956a9bf9fb99471052834ff0a89592860fb094321d3d100abc0fb29
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It employs a link farm and SEO redirector strategy, using URLs like 'https://midufefew.ru/strik?utm_term=behringer+xenyx+x1204+usb+asio+driver' to lure victims under the guise of driver downloads. The presence of numerous external links, many pointing to PDF files, suggests an attempt to distribute further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://midufefew.ru/strik?utm_term=behringer+xenyx+x1204+usb+asio+driver PDF link annotation
    • https://cdn.sqhk.co/gojelonub/Vhitb9A/pvp_galaxy_fortnite_code.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/3iaGHge/3044121219.pdfIn PDF document text
    • http://werojati.getenjoyment.net/livogusirulod.pdfIn PDF document text
    • https://pedagojewixa.weebly.com/uploads/1/3/1/3/131398360/pedam.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/gejujumosu.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/20584229458.pdfIn PDF document text
    • https://xevekarisugi.weebly.com/uploads/1/3/4/6/134697334/8d3ef71.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/29589732203.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/f1357.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/airline_reservation_system_project_in_java_with_source_code.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/ghb2uFV/voice_access_2._1_download.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/palevijuj/how_to_draw_what_you_see_by_rudy_de_reyna_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/asus_usb_bt400_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/change_label_template_existing_word_document.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/bamboozables_puzzles_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/github_udacity_android_me.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_b79a50a517de423592f94c3d2e77660d.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_f69423e3118f46ce8330febe13dbc302.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vigevot/manufacturing_planning_and_control_for_supply_chain_management_the_cpim_reference.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_17c1ae26b3f6486fa29f00363a9f8c53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/equifax_credit_report_form_by_mail.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_5f209ddfe5f242ef9bfa64bf169ce5e6.pdf?index=trueIn 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_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 5888 bytes
SHA-256: 7a7b8e82375d882170d978fc1d23ee7e273cf0c35778c881a25bb8e975ad5b35
font_01_sfnt_off0001371d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371D 11140 bytes
SHA-256: 4cef9f29ad8653ee8163d2a9a86793fc3ab04c32e57c26b0b22b4ecd0449847d