Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e93fc5e9b398e2…

MALICIOUS

PDF

96.2 KB Created: 2021-01-06 05:28:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b71bfdd60b6df6d34c51f81b1c52dc49 SHA-1: ea5da38a159337f850d880897fd5e3c57d2fc69a SHA-256: 10e93fc5e9b398e2c639e95ebb4dd89e90d09e3bc4e6f1895f5a496951e62c1d
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'trafftec.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a chapter summary, aligning with social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://trafftec.ru/123?utm_term=the+mermaid+and+mrs+hancock+chapter+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417313/normal_5fe9d42b249f5.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/iiicEie/maki_favorite_social_networks_in_one_tiny_apps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5fbf43ffe9a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f8a4d0a50b30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_5fddaecd829ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1a56a6-fca6-4fb3-9b03-d482fb038814/norton_anthology_of_american_literature_shorter_8th_edition_volume_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38c8ddf-3c6c-47ac-9adb-bef7dc26faa1/88419045167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaabb13d-7b16-4eb2-af78-7dd03884c174/harry_rides_voldemort_fanfiction_lemon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77f6a9f-a483-4890-ae19-ca0000981b14/cross_disciplinary_define.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92dd8f63-80a5-4ab8-a06f-c7fe4f7ab921/petroleum_engineering_colleges_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2481a77f-2f9f-463e-a6f9-899769b59e1e/takizikegitonegidaxisexu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 5396 bytes
SHA-256: c0ac9e9b31a34fee555ba6f0809592efceb03cac8b71e3ec12543dbc41f78a6d
font_01_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 1884 bytes
SHA-256: e21ba0a43935dd87d43a5cab01f72200b1c8815ad520136e4812c1fc4ea54bff
font_02_sfnt_off00013593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13593 11472 bytes
SHA-256: 36e636c4a2e41091a3e3f2e88de3be389c2d09e6a780202d3726add5363f2eab
font_03_sfnt_off00015ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEB 16548 bytes
SHA-256: adda0b0380b710ebf0c1d7624c579e9292c638228efd0fa11be61117a9fd29fc

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