Malicious PDF — malware analysis report

Static analysis result for SHA-256 f848b3fe69d5332a…

MALICIOUS

PDF

77.3 KB Created: 2021-04-05 08:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c33e235744e02f07c4d35556affac8e SHA-1: 566d708cd152d1fd953f5c0a86367b428e8d260c SHA-256: f848b3fe69d5332afda0b7adea31d71928c554c5b072ae5eb1c164dd44317cfd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/award?keyword=flirting+questions+to+ask+a+girl+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372987/normal_604cdf1c32694.pdfIn PDF document text
    • http://devgm.design/algebra_2_common_core_edition_textbozxy1b.pdfIn PDF document text
    • http://armlur.space/rugaxoxobajibotuzalyr85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_600c012319a95.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/streamline_english_book_free_download.pdfIn PDF document text
    • https://kumekebiwoxig.weebly.com/uploads/1/3/0/7/130739238/9bd550e.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/fopofutib.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/843cd66f33156d8.pdfIn PDF document text
    • http://itclick.info/75415030494cslc1.pdfIn PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/davaboja.pdfIn PDF document text
    • http://flash-sar.online/nuwojatusukitakodarekubv1eon.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/d6160d100.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_6025a318186e9.pdfIn PDF document text
    • http://it50life.pro/4705128412743c.pdfIn PDF document text
    • http://gmetry.online/lixumajevezabefugekt9ohp.pdfIn PDF document text
    • https://sezitoxonuga.weebly.com/uploads/1/3/4/8/134886233/jewenopasurix_jepufuladiwo_tenuso.pdfIn PDF document text
    • http://sewonmedix.ru/25135315551k0r45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369915/normal_5ffe4743a4378.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/transesterification_biodiesel_production.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/verewibefi.pdfIn PDF document text
    • http://epaytds.xyz/66429504076jjq00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidegaf.atwebpages.com/machine_learning_forecasting_models_python.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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5356 bytes
SHA-256: 784155b7ac4987d160a476665a058b7ab92268c4932a498246e84a37baa34e91
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 12084 bytes
SHA-256: 9b1787bdc19d0b8f5f869b0d03085c4857e9a06eb31047af75db4d513a9f31a8

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