Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d11db3104b9b94…

MALICIOUS

PDF

93.5 KB Created: 2021-04-21 22:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b53e9a85a5a2ffdae5498a9363aed65d SHA-1: e7c153b68f77ca074b7dbe09f002676610cc0f24 SHA-256: 15d11db3104b9b945e60721f22bf18db9f39e050d43b87df86f943d7849ecd2d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://midufefew.ru/strik, is likely the destination for malicious activity. ClamAV detection and ML classification strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=basic+accounting+made+easy+win+ballada+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366964/normal_604185ff16450.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/norusisodenur.pdfIn PDF document text
    • http://albl.ru/6138453928xnet6.pdfIn PDF document text
    • http://copyright-securityx.com/salipibufiwemeyixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_6057a2077c6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6045024451edf.pdfIn PDF document text
    • http://videohost.space/31456650303mqclj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464319/normal_5fe97f162b62f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_6055f0c666679.pdfIn PDF document text
    • http://frut-tree.site/jijojobobuwesedezafzodc.pdfIn PDF document text
    • http://detonic-ro.website/rowagurozowagalud3dflj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xesigeze/mujipiweked.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/hd_movie_in_telugu.pdfIn PDF document text
    • http://gemawinikifiv.myartsonline.com/que_es_bailoterapia.pdfIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_59cddbf2fd4f47d49fe9403f9c738674.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotizifime/lunoxosisabigufaxazop.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/como_saber_se_ta_na_hora_de_terminar_um_relacionamento.pdfIn PDF document text
    • https://a9b72ff8-ed6f-4212-96c6-d467cc4e2332.filesusr.com/ugd/7f5649_6a495c600d17492b9be39ae553851b65.pdf?index=trueIn PDF document text
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_f16e8480962b4ee0bac7b51f6eb91bc5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokudapele/wezigifapazadoguzu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 5644 bytes
SHA-256: 5ca556d422be6e2a705ea5fd20fea2a394b4e842b5b553bbc3e4298c6473e974
font_01_sfnt_off000133bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BF 11424 bytes
SHA-256: a9eda977958a9a23e704ca966c6dfd8e3bc44b61e2163283b3229dc07ef19200
font_02_sfnt_off00015a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A82 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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