Malicious PDF — malware analysis report

Static analysis result for SHA-256 9915ca8f8513114e…

MALICIOUS

PDF

79.0 KB Created: 2021-04-03 05:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f4ee0e7fb4d52caff2cc90ba0305c64 SHA-1: dc8727edc6b0cc570af501317f3e8eca1af9ba4a SHA-256: 9915ca8f8513114e3e0be182ffe4b29d1ae518d767b344da0c8422c421b22e20
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm, likely to distribute phishing content or further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=oblivion+jennifer+armentrout+pdf
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/xopixebiduguf.pdf
    • https://static.s123-cdn-static.com/uploads/4450045/normal_6004a523dd1f2.pdf
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/fbe5180ce1df.pdf
    • https://cdn-cms.f-static.net/uploads/4368962/normal_604865bc0b6b8.pdf
    • https://jefomigakugilo.weebly.com/uploads/1/3/4/5/134597358/43cc33e.pdf
    • https://tonewebebajuja.weebly.com/uploads/1/3/5/3/135319275/nevevet.pdf
    • https://cdn-cms.f-static.net/uploads/4502248/normal_601ae549ac8b7.pdf
    • https://zifofuxe.weebly.com/uploads/1/3/5/3/135386801/3f4318e59533a.pdf
    • https://sogitinavebifi.weebly.com/uploads/1/3/5/4/135400198/xigunuxi.pdf
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5fdf0d19356e5.pdf
    • https://cdn-cms.f-static.net/uploads/4465398/normal_60285c0f0ebdc.pdf
    • https://wuvozova.weebly.com/uploads/1/3/4/5/134500004/nojenotuvawixesisena.pdf
    • https://pawigesi.weebly.com/uploads/1/3/5/3/135389203/1649470.pdf
    • https://defuboxuzunusam.weebly.com/uploads/1/3/3/9/133986960/6753332.pdf
    • https://jepifobowokeba.weebly.com/uploads/1/3/0/7/130776363/ed628351b44c0.pdf
    • https://pagununida.weebly.com/uploads/1/3/4/8/134861868/3484098.pdf
    • https://zexonozanefamiw.weebly.com/uploads/1/3/1/1/131163740/2017701.pdf
    • https://vudelugofede.weebly.com/uploads/1/3/4/3/134383428/sekafaxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jiwotarotavuz/daily_routine_template_excel.pdf
    • https://s3.amazonaws.com/lezopobigeza/pojoru.pdf
    • https://s3.amazonaws.com/turip/12079521850.pdf
    • https://s3.amazonaws.com/tutapaxi/83698628164.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/live_indian_tv_channel_apps_free.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_off0000f487.bin
bfc672ee2444ceeb62e79b8c25b26f9068b4010a87a9c747ad364cc7c89fa4f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 5312 bytes
font_01_sfnt_off00010686.bin
1aaad5cf844b6c05c122dfc1c6ba47953a10068365ea92f16d3185a1dc877921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 11372 bytes

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