Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd81e9700e87bb7…

MALICIOUS

PDF

77.5 KB Created: 2021-02-08 14:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a73a7b3a77fc40b605ad962e9e20ad8a SHA-1: 75b7e58bc0cffb0eb86dd1e7b0c913a1fa023b0a SHA-256: dfd81e9700e87bb79c146a544d93890412cec738b05ff12d7a7ba380435fb258
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/aws?utm_term=kaththi+coin+fight+bgm'. This, combined with a high ML classifier score and ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware delivery attempt. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • 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/aws?utm_term=kaththi+coin+fight+bgm In PDF document text
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5fd09caf44dd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5fcf858637193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417519/normal_5ff1ff28a67c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455907/normal_5fdf196d6de5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_60024ea76c64a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370064/normal_600397c12ab67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5ff61910edca9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5feb40df9b2ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365598/normal_5ff15064d74a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sajatofubote/brain_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/80966193121.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/apk_add_text_to_video_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/bicycle_crunches_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/biomedical_engineering_project_topics.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
    • 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
font_00_sfnt_off0000c4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CF 4768 bytes
SHA-256: 27d67c60d280b12052cd9f81231043234b65cbef45643185395a8c2fbb83dd39
font_01_sfnt_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 1972 bytes
SHA-256: be348a22fe190728f1d360d8e10ea682a14f6dd4ddd02d80d69c8b9c0587fdb5
font_02_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 10780 bytes
SHA-256: c33965dd0fdbab8d8f7b2acf4b92927e83885fbe7dd23932fc89663ad167df53
font_03_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 16304 bytes
SHA-256: 8fe31ac2096c5e11ca20e474ac9d4b0e624cd7c6a3d6648e58269b78a2b36287
font_04_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.