Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b743ef403d5a53…

MALICIOUS

PDF

68.8 KB Created: 2020-12-16 10:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 17c9c1c61abb2c3a72ff09d6ffb17217 SHA-1: db3d0ecfbca8351b03f2a9aaecc1b6bd2e78e900 SHA-256: d4b743ef403d5a536b1cf58b4876376db6b2a3d03ee7516f2f5763e65b354c4e
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffmen.ru/123?utm_term=castle+pellet+stove+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_5fd824f9a2621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5fcce1e9437f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f9715eab41d4.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/fedojigudaj/levolizokivatenek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4da5e8-cb4e-4a69-bf1f-b50926bb9476/revud.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/vufiba.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/60874108072.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/suvexuxivogosekujunixuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb41a92-c9fb-4341-9d8c-12f8e8df77bf/gifipesarekebarojinemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46558968-403c-4dab-9a61-24978c75daa9/74789795773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa6d258-68a8-4d34-9e48-046d43484eca/13954037268.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/asatoma_sadgamaya_khaad_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6441a57a-9fd8-457b-99c9-682d1666a00e/hahn_appliance_tulsa_41st.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_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 4832 bytes
SHA-256: f197a8c4882d7810cd9a93becd83dbda7ca292114ef19cfda0a7859273ae16a9
font_01_sfnt_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 10376 bytes
SHA-256: 9ab931ed25cd6de9ffa09e992fcea3985ade05c84416f7ead1b45a470e9e135a