Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd18f6d0fc5f7c2e…

MALICIOUS

PDF

86.2 KB Created: 2021-02-25 20:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 18c4e66a510aafd3796eb432c34de828 SHA-1: cd3e77e27ef8049c28659d31fed51ee4adbeeece SHA-256: dd18f6d0fc5f7c2e18db93dadfd6419891245ee06c40dd18beda8f329b318d39
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+work+out+the+area+of+a+triangle+using+sine+rule PDF link annotation
    • https://cdn.sqhk.co/zezegawutogu/gjii3Wm/ketotikoribivug.pdfIn PDF document text
    • http://slmit.fun/311006053949dnok.pdfIn PDF document text
    • https://cdn.sqhk.co/vebudirepo/stVuVji/stick_war_zombie_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/qhenqge/exion_hill_racing_game_download_for_pc.pdfIn PDF document text
    • http://salearea.pro/355633392822i47x.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/ibxheKJ/ocoee_pediatrics_cleveland_tennessee.pdfIn PDF document text
    • http://mozujana.22web.org/robot_0._2_link.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/plhiC7b/duxaxegu.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/hh4ejj2/tap_tap_builder_online_generator.pdfIn PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/11b554507247.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/gidrKY7/21830350156.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/1sGVfJs/wijovovotorubo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasosurid.epizy.com/amphibole_crystal_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/appsc_general_studies_previous_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/asus_q550lf-bbi7t07_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/irobot_roomba_870_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/wovage.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_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 5144 bytes
SHA-256: b7d1fca8aeca56d287340a564b725d6d9bc4ecad2bb51efee7b73ce1041a0837
font_01_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 12772 bytes
SHA-256: 92239dd67a0a4cd3dcde1c2a8003d1f3a349c067ce7290c8090bab1d2708b46b

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