Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e54bf90b3c73ec2…

MALICIOUS

PDF

72.9 KB Created: 2021-03-17 00:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82a0d2151dd1deb316ec281b11b57666 SHA-1: 951dfb6c2ca5c538c42b45dc4d66a2306ae054a0 SHA-256: 9e54bf90b3c73ec23647734a11469770e33c00a1c3f5dbf2091776eb9c7b21e7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to direct users to potentially harmful content or phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=rainbow+landscape+rock
    • https://cdn.sqhk.co/buzulexoxuve/jjlgghi/99644040000.pdf
    • https://cdn.sqhk.co/junikesiza/8ricjiF/98530402413.pdf
    • https://cdn.sqhk.co/vorowobenune/fhigigC/71310977376.pdf
    • https://cdn.sqhk.co/livaxipovage/XimihGu/pujevubarusobafon.pdf
    • https://cdn.sqhk.co/juxezijafoz/ifkOfpH/tamil_cut_songs_love_failure.pdf
    • https://cdn-cms.f-static.net/uploads/4411493/normal_601b18138f614.pdf
    • https://cdn.sqhk.co/kutajanode/agda6je/wifi_channel_analyzer_mac_free.pdf
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/tuduje.pdf
    • https://cdn.sqhk.co/vipikunowi/ejcujaF/xuxunewasoretevupafena.pdf
    • https://cdn.sqhk.co/jubawiwa/eyjgHhU/battle_craft_survival_offline_apk.pdf
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/6165917.pdf
    • https://cdn.sqhk.co/zerurukoraju/jFMjchg/51728144052.pdf
    • https://cdn.sqhk.co/pimupigedu/l4whijU/fifa_world_cup_2022_qualifiers_africa_groups.pdf
    • https://cdn.sqhk.co/nefakovuwot/igjigcJ/lazigudutepe.pdf
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5ff8f2278117f.pdf
    • https://cdn.sqhk.co/luwesefizi/bbjgjhe/jofumewisurudi.pdf
    • https://cdn.sqhk.co/natokaze/Wjfgf4N/womens_halloween_costumes_uk_amazon.pdf
    • http://tazanup.mypressonline.com/how_to_be_studious.pdf
    • http://leririv.sportsontheweb.net/83216768488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://visugog.myartsonline.com/dozanuvimuji.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_off0000de63.bin
859182c198f2f7227e1925d6beae23c5520a3b50ba6809071fb3a6a3ed32613a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 5372 bytes
font_01_sfnt_off0000f0c4.bin
1b8953f5aae24e8ac4d4f53890c8fb9bd9d38574611fd68a1f0f0ebe6b648510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 11108 bytes

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