Malicious PDF — malware analysis report

Static analysis result for SHA-256 990fb6b8b949d55e…

MALICIOUS

PDF

84.6 KB Created: 2021-03-29 12:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ec97795e5da958186b6487a29b3bb8f8 SHA-1: 2122db4e080d961e2a52aa4eb2d951e34a74b0f6 SHA-256: 990fb6b8b949d55e5c672a1345b3b8c26a7b537fb3a3662e60f5177f72613e01
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that these links are intended to redirect users to malicious infrastructure or to manipulate search engine results. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malicious redirection attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=fundamentals+of+electrical+engineering+book In PDF document text
    • http://mobufuwiwid.medianewsonline.com/buddha_quotes_in_tamil.pdfIn PDF document text
    • http://xemakaze.mywebcommunity.org/tegiliganodijejopa.pdfIn PDF document text
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/7813157.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/waste_management_project.pdfIn PDF document text
    • https://cdn.sqhk.co/xizowabik/WY8jdKy/fusionner_2_pages_en_ligne.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/ihgf6id/94166048901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fdf2f7b24f02.pdfIn PDF document text
    • http://vejuwetuk.mypressonline.com/embryo_development_stages.pdfIn PDF document text
    • https://xarudaxukisa.weebly.com/uploads/1/3/4/0/134018653/4051768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481053/normal_5fd5f2133e1fd.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/radilefizesu_dopevuw_lamuwenuwewute_kibamek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_600c64e6d6ad9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/xijosamirob.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/51410935615.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/gexoredumomuwimaxaxofa.pdfIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_48ac549137ea4b4a9e421f3010a0c836.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_66e1fcf4a9e045b49a69059d05e7b079.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/47504037360.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/charmed_movie_free.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_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 5500 bytes
SHA-256: 2d6f3deb44819645a2ab1d30adad6211cde50c6176dbf86cb395bb1da9fde20e
font_01_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 11636 bytes
SHA-256: 8e8a0cecf522fd4a34509008eb9fae823161fec2cd2f260b31eaaddb0b09e1c7

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