Malicious PDF — malware analysis report

Static analysis result for SHA-256 303b647846dfc8e9…

MALICIOUS

PDF

89.3 KB Created: 2021-03-27 10:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d201512a6f106e186920f442d048afa3 SHA-1: 5abe920a3e2e2f59e2e387040c7d7674c1cf3476 SHA-256: 303b647846dfc8e9c910f014b93462e7257c033ae3944cbee4b4498c5bdaca23
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/strik?utm_term=casey+charles+gender+trouble+in+twelfth+night PDF link annotation
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/ritinorose.pdfIn PDF document text
    • http://imm-shoes2.club/airbrush_pro_free4do2w.pdfIn PDF document text
    • http://kitufavurakural.iblogger.org/37618259974.pdfIn PDF document text
    • http://jogedisilokazex.iblogger.org/reducing_relapses_in_mental_illness_worksheets.pdfIn PDF document text
    • http://subonus.ru/savudupofubojolikoguimpjx.pdfIn PDF document text
    • http://likelid.xyz/sudazekev72ttk.pdfIn PDF document text
    • https://pilinasovoda.weebly.com/uploads/1/3/4/1/134132167/3169af7c751.pdfIn PDF document text
    • http://leree4.club/7_libros_apcrifosgcuc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fdeae09a6d28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419415/normal_5ff3fd48acac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_602509a2e11e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_aac9f88107dc4c0c9ca74d1d81af2e81.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_a39914a5e3c14c72b0dce1c032affc30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropuba/who_is_the_most_dangerous_inmate.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/64909655182.pdfIn PDF document text
    • http://vimonaker.epizy.com/7256046491.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/skype_desktop_windows_8.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_e029151e6fd445088cba5a5be8f81352.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/79737004563.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/gosobowidononodot.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 5520 bytes
SHA-256: 61a9d136227153e01e5bb288e6d697acc081ff34a0d34880b83613b999fb133b
font_01_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 10960 bytes
SHA-256: 5c9f155ac8a39baa070a5115844e9d31f73a6258b1f46d953331aef0067ce574

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