Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5edc14bae4a56ec…

MALICIOUS

PDF

70.5 KB Created: 2020-11-29 14:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a73c65932d578c6515d21a8867a5b488 SHA-1: 907dcadf8d159e134d252ad16f6d8a206af76220 SHA-256: d5edc14bae4a56ece18c4d073e9896338e1461416c9273037ce86d45ed306d3c
254 Risk Score

Malware Insights

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

The PDF contains a fake CAPTCHA lure to trick users into clicking a link. This link, 'https://gettraff.ru/strik?utm_term=letterbomb+wii+sd+card', redirects to known malicious infrastructure. The document also hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://gettraff.ru/strik?utm_term=letterbomb+wii+sd+card In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f9c43258e543.pdfIn PDF document text
    • https://fabobabi.weebly.com/uploads/1/3/4/6/134678451/4186909.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ee857c-fd73-4a8a-8b4d-2df04a97f8d9/genius_hour_research_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b081424a-3e72-496c-b2de-4cb9ec33d5bf/vbuck_gnrateur_aucune_vrification.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/81925955882.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/keeping_track_of_expenses_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/xaburilisejewodofatosajep.pdfIn PDF document text
    • https://s3.amazonaws.com/dirijazi/serelofivezo.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/82006245430.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/define_controlling_idea_in_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde3ac35-45e0-4a79-8ce3-e8132b8ac0ee/22923097418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd6894a-12af-49ba-87f1-dbf57c6c1c59/wapogibuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22541da-e2c0-47ab-8ba6-865f7437b3a1/lejeniloxuzete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf30d0d-8482-45d3-b60f-fee2de61053c/halliday_fundamentals_of_physics_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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 5228 bytes
SHA-256: 1781bbc5ef6ae9d2fd86c672274aff3e5c3c5547c5fa9d338276321a2be6902a
font_01_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 10668 bytes
SHA-256: 39df7d0bdedd97240b58f7a7abad8ee5f5f4814192288f640f7fe64dfebf9fd1