Malicious PDF — malware analysis report

Static analysis result for SHA-256 17369f9a7865abd8…

MALICIOUS

PDF

88.2 KB Created: 2020-11-19 15:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cf552b01082839598b3c505f4536f21d SHA-1: 4b968ec13849165cdd6a1d4b6bfee33d7db8a6a4 SHA-256: 17369f9a7865abd8be38f687eb0aa0bbffb8f485903be4b09fd883545c2a9d7d
104 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URL `https://trafffe.ru/123?utm_term=korean+grammar+lessons+pdf` suggests a phishing or malware distribution attempt, disguised as educational content. No scripts were extracted, but the overall context points to a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?utm_term=korean+grammar+lessons+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5f9f939b4c744.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://uploads.strikinglycdn.com/files/95049982-69e7-4991-97ac-8f76eb432815/18882060314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d785573a-8708-4874-b54b-4a32707b5bc0/70082833203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e036a9-8b98-47e7-844d-fe4d4c483f91/xevudidevixuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd321c4-44b9-4035-9cfb-834cc529ad9f/92769010245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0c2397-d594-47e6-8c4c-adf58cb0835c/buvaguluxug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce93e87-f537-49d7-8209-5fc1a6b0f333/74819798470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7233678a-efb9-4d67-9fd7-f6e4e5c0b9cc/43729324767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d29f41-2c88-44b2-bb64-d9388e2f089d/70972441197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d87aeb-285d-4984-82d5-7db9152c4939/15541228760.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 9680 bytes
SHA-256: 0e23d96c61d7f1fc65acf6d0c138b9e9a6c85acc44d0a845d59b50b7e7431d50
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 4988 bytes
SHA-256: 98c7b08098db21063b45044fa5bfe760fad17fd3123d9936d63d44c018547265
font_02_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 10904 bytes
SHA-256: 92149116b8929eac6fe0457af272cea8f86ea817fe1d967c773acee0d2956cf4
font_03_sfnt_off000130cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CC 16060 bytes
SHA-256: 1018660efa6a1a00280f0dbd6ee9814149b2344b9acf14d98de2cb76d1e712aa
font_04_sfnt_off00014563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14563 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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