Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d3b13d14915998…

MALICIOUS

PDF

69.8 KB Created: 2021-03-31 21:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e6ab34b190e44db293614fe1221d259 SHA-1: 77ff20529997dddff273da61ac80df45b57310e5 SHA-256: f5d3b13d14915998d7afe58a48e2166362240394ecb975a847afb188ca5100ed
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, which is likely used to host phishing content or a secondary payload. The document body, though heavily obfuscated, appears to be a lure related to a book title, suggesting a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=the+firm+john+grisham+pdf+penguin+readers
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5ffa26fd49598.pdf
    • https://cdn-cms.f-static.net/uploads/4365583/normal_604d284cb9655.pdf
    • https://static.s123-cdn-static.com/uploads/4448991/normal_5fca9ec4a1a62.pdf
    • http://wspring.space/756590254674f3hh.pdf
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5fcefe37e3e61.pdf
    • https://cdn-cms.f-static.net/uploads/4427287/normal_601a04acdbca1.pdf
    • http://demask.space/contemplate_meaning_and_sentenceb3ne2.pdf
    • http://feyakast.online/dijatepirakiwurapikapur2ydq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a55da23-a04c-4e68-9fa8-14133f64e727/jilagopusepa.pdf
    • https://uploads.strikinglycdn.com/files/fb525141-c53e-4117-bb19-1d10fd60d565/55367895557.pdf
    • https://uploads.strikinglycdn.com/files/2078b897-594c-4e80-90e7-c9f4fa6170bd/40653218517.pdf
    • https://uploads.strikinglycdn.com/files/58d6f73b-ae83-4373-8fd4-66cc43da7398/depoduruzadawasiz.pdf
    • https://uploads.strikinglycdn.com/files/dbe14eef-3dc5-4dad-9a8b-fcee62e983e6/99435897980.pdf
    • https://s3.amazonaws.com/lezopobigeza/asmaul_husna_adalah_nama-nama_allah.pdf
    • https://s3.amazonaws.com/jopomodilamego/murexovotemobegufiman.pdf
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_d95ec161e32843dc93a0b45dcf940cce.pdf?index=true
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_b18d3de0331d454eadab3afdfd0fa00c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3ca8eee-5924-4a05-b378-1bf0130c08f9/arduino_uno_r3_pins_description.pdf
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_27abcec0eea24d8f999fc02c878e850f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d108.bin
b00f78b7f55945fcb5e647c496e695842a05a34721de61d258ed6e1d04bc9b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 5448 bytes
font_01_sfnt_off0000e36d.bin
52469f5845629b4309585b9ecef5b2a33bee71941f772d6e9f02f1bc38428136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 10788 bytes

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