Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddeef769567b1f4…

MALICIOUS

PDF

88.6 KB Created: 2021-02-22 00:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4919f223297f58d42edfd83b361df97e SHA-1: d1b387e2fd75cef5c65dcf4be909e0800149a644 SHA-256: 8ddeef769567b1f4a23c2c452d44526997a56afc592c2843482973cb2d48eb34
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or SEO-based malicious content distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=is+procreate+5+only+for+ipad+pro In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_5fe6af92dd8e8.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/OGgiiht/13475052109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_601f02feeccdd.pdfIn PDF document text
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/a0106604a.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/CigDjgW/begakuliwusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489241/normal_5ffa1a4d56ad6.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gekojulog/9344465694.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/68206673728.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/chelsea_vs_arsenal_highlight_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/free_probability_worksheets_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/jack_o_lantern_face_templates_free.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fc8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFC8C 10880 bytes
SHA-256: 754261785bcf80dc657d94f5c89d094fcd4fa6336e50d9177e549d897e21f6c1
font_00_sfnt_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 3132 bytes
SHA-256: 3d94f9b3370b846ca7d0899cbe47d0cb87064006fe492af734c2ca9f2900066d
font_01_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 5312 bytes
SHA-256: 2d998db012f966602058b63ae2983f9497c9ceec889f336791b2173823058f4f
font_03_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 10364 bytes
SHA-256: cb215dce5e17b88d05dc1afda71e79689f9f199e6d5acd395afe049f85463954
font_04_sfnt_off00013ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 16380 bytes
SHA-256: 2e1dcfa215ff7068e156f9bca6f25e666cb310e753e20272ef9c89573ef626fa

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