Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8595b8e58691fc…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 00:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 964f7a777a5d3f3aa61c14c4a71afa58 SHA-1: 51aeb5105f49121640da6538795b7c5d2770b5b0 SHA-256: 9b8595b8e58691fcf2a607a9ae910b0213214c95662ba2546a420365c081cb4a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL pointing to a domain that appears to be used for distributing malicious content, disguised as a free ebook download. The presence of this URL and the malware detection strongly suggest a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=cincuenta+sombras+de+grey+libro+gratis
    • https://cdn-cms.f-static.net/uploads/4470532/normal_5fd1ba4784700.pdf
    • https://cdn-cms.f-static.net/uploads/4387230/normal_601df55a45b9c.pdf
    • https://cdn.sqhk.co/lewatesudo/jhgd4ic/tidujebuluxudexeki.pdf
    • https://cdn-cms.f-static.net/uploads/4477173/normal_600d40df9e60b.pdf
    • https://cdn-cms.f-static.net/uploads/4485321/normal_601da7c8a608c.pdf
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fcf7634e0686.pdf
    • https://cdn.sqhk.co/zufutetuwume/gjjgvhg/36371771339.pdf
    • https://cdn.sqhk.co/pojizurigos/ghhckxj/19122695309.pdf
    • https://static.s123-cdn-static.com/uploads/4446027/normal_5fed59dc9a7c7.pdf
    • https://cdn.sqhk.co/xevowuto/akjajjV/kubefobebatupafitego.pdf
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5fc8660029110.pdf
    • https://cdn.sqhk.co/vatukaso/gggigig/gokenisifizol.pdf
    • https://cdn-cms.f-static.net/uploads/4472753/normal_602be1e4a2e35.pdf
    • https://cdn.sqhk.co/kelopifagisu/3JDDGJY/ballpoint_pen_brands_in_philippines.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xugigabitulu/12366448169.pdf
    • https://s3.amazonaws.com/tuletivotarupu/kit_dls_juventus_2020.pdf
    • https://s3.amazonaws.com/donukadizolin/73521382479.pdf
    • https://s3.amazonaws.com/zebarufuridorur/legebirubuzufena.pdf
    • https://s3.amazonaws.com/getizar/agar_tum_mil_jao_ringtone_female.pdf
    • 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_off0000e6c0.bin
25f76681d2b42448d7b67f4e1afa375e56572793cad5bdc0f7b4de33a52f1263
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 5404 bytes
font_01_sfnt_off0000f907.bin
33bddcbc321a30be4c05a2ceadd4de5bd7334c4a2e1e787dc3767f92684ea7e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 11520 bytes