Malicious PDF — malware analysis report

Static analysis result for SHA-256 f397f5edbd03c8c3…

MALICIOUS

PDF

76.0 KB Created: 2021-03-09 02:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0eb4c343212c1c58702fa2f3cbfe003a SHA-1: f1bd3acbd38503eaeb037f08ad1dc2c71bf86845 SHA-256: f397f5edbd03c8c3ec07e40b773d1bcd6a85c347693cd9cef07c78a550a7abf3
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, characteristic of a link farm, and the ML classifier strongly indicates maliciousness. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into downloading a password-protected archive, likely to bypass security scanners. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/123?utm_term=kindle+reader+for+windows+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373517/normal_60029f0617191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373240/normal_5ff115e2631a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498883/normal_5ff14db9ca866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_6042dc50ae507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_60339f7d4b2d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468837/normal_5ff0bb46b21be.pdfIn PDF document text
    • https://tuzokoluxalof.weebly.com/uploads/1/3/1/3/131382257/dusijuzemovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5fca206ade5a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_5fd8548f51a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_601543f0ec289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5fdb3e09ba0ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fc86c16e3376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_603ced6212f67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_602cdcd661a80.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/siwajozevodav_nizufitu_lugutokoj_zapunofenipuji.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/kexamoxusinixu/paltu_kabutar_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/rubosumatimagusukix.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/ammyy_admin_3._6_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/zaravuwirikukajewemob.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/84819843410.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/arboles_de_navidad_originales_manualidades_faciles.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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 4960 bytes
SHA-256: ecc4608b86279d993b234ecff42e02f868f91f9bc339482c2cb3e8c890c80d2e
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 10152 bytes
SHA-256: 44a9b3f1dcb82e562c0da7d5602fca0385b132afe1ea84994bf66d97b5e06dd5

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