Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafbd572bca208cc…

MALICIOUS

PDF

77.3 KB Created: 2021-03-08 04:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2623988034e9ac356f30d93c79bc5816 SHA-1: b4d2d57a9d502a8b0216663cc5f736a109e93a97 SHA-256: bafbd572bca208cc975b480139f1c270954b1e56cb4753b8199b3d6ef806f9cd
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier assigned a high probability of maliciousness. It contains an embedded URI pointing to 'https://nipisod.ru/wix?keyword=advanced+user+search+pof', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata related to its creation, suggesting it was generated by wkhtmltopdf.

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://nipisod.ru/wix?keyword=advanced+user+search+pof
    • https://cdn.sqhk.co/pixazizaze/7ggjrXJ/kodiak_weather_radar.pdf
    • https://cdn.sqhk.co/wiluxuko/jiL48qq/44583247005.pdf
    • https://cdn-cms.f-static.net/uploads/4445320/normal_6041bf6286686.pdf
    • https://cdn.sqhk.co/vefomatakin/7o7jchb/37266672680.pdf
    • https://cdn.sqhk.co/dogutadova/0jjjilc/17986961551.pdf
    • https://cdn-cms.f-static.net/uploads/4470980/normal_6045854fdbb98.pdf
    • https://cdn-cms.f-static.net/uploads/4485442/normal_6028e70970a2a.pdf
    • https://cdn-cms.f-static.net/uploads/4401517/normal_60430c0de2f72.pdf
    • https://cdn-cms.f-static.net/uploads/4500200/normal_603bc809163bb.pdf
    • https://cdn-cms.f-static.net/uploads/4465704/normal_5fd75f0fa186c.pdf
    • https://cdn.sqhk.co/nasubivapu/iihyge4/samsung_galaxy_s_ringtone_original.pdf
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/8796403.pdf
    • https://static.s123-cdn-static.com/uploads/4503035/normal_5feea59a415ff.pdf
    • https://turexebino.weebly.com/uploads/1/3/4/2/134265835/genegiraporuni.pdf
    • https://cdn.sqhk.co/razotefo/haygcib/xovupeget.pdf
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fc8bf05c47fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_d2f1f5a8b0ed4795a16f5ba0b131ef96.pdf?index=true
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_aadaeb7fe7a4439aa33d4a5500d52f3d.pdf?index=true
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_3f3a6a604498474392aa114df777e4b8.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_off0000f316.bin
a10037188c1a3f5b927c71acc8d5f0f3dad27349e5bcd71d6c644d9d8cafad76
pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 5260 bytes
font_01_sfnt_off000104ff.bin
55cd008cd52598d9b0d7f963d8e1f8f3c543ef1272c55e4faccf611a94cf55a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 10372 bytes