Malicious PDF — malware analysis report

Static analysis result for SHA-256 3991b9099f5d5371…

MALICIOUS

PDF

63.1 KB Created: 2020-12-08 17:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1f18add45d09654ec46640b878fe8756 SHA-1: 20cfbab6d1d6bbe7cf37fefc2fa2cb3533520570 SHA-256: 3991b9099f5d5371df4f0aa0cab6159bdbdb05688f159019c131a19ead833624
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://trafficel.ru/strik?utm_term=prince+memorial+library', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a 'Prince memorial library'. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly suggests a phishing or downloader attack pattern.

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://trafficel.ru/strik?utm_term=prince+memorial+library PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498324/normal_5fcaf0250a590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc294b8ea4a794d564fdff1/t/5fc46a2aeaf37e3b6429b46e/1606707756457/57692852816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f141c24-ed8d-453e-b764-45924192da31/pub_kit_kat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8359f4ac-570e-4d2c-94a4-69170fe59011/lifasek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e49b023-1f4e-4be2-8d77-f52497aa6938/jopifikotomorotula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c236f79-c48e-49cd-8d80-a7ba62487ddf/rules_of_attraction_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c8af79-ed52-449f-a147-6185182673c8/minecraft_potion_of_water_breathing_id.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36737bdb33045eed226b2/t/5fc4d41861e25426e1cfdaa2/1606734873655/bts_concept_photos_love_yourself_answer.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78a98bcf5f06bcb796135/t/5fcc629c1e1a4d7de1219ae0/1607230115107/purin.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc39b6c5687f52b6b922f37/t/5fc44e8be18c5c478e84ac35/1606700683681/dexter_mat_cutter_blades_3.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

Related samples 3

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5E 5008 bytes
SHA-256: c9e44c63ca5417428f6fff210b7be84013b59100adaf5ba8d2aeaaac04dd0d4c
font_01_sfnt_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 9848 bytes
SHA-256: fc0df490f63ea1619412abe30e500e4405efaf813c6b839196effe8b0f2bec24

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