Malicious PDF — malware analysis report

Static analysis result for SHA-256 b989d7f8d4163470…

MALICIOUS

PDF

79.6 KB Created: 2021-03-13 15:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 916d534ac1fb04aacd29a87d7e9c3955 SHA-1: 206e2afe6d24cbbbdef04084386fe92df5f89c36 SHA-256: b989d7f8d4163470a380174b39f8d0ece768072250acfab35516f7457df8f36f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to Weebly and other free hosting services, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate maliciousness, specifically flagging it as a phishing trojan. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://vilenefex.ru/wix?keyword=apk+mirror+ipad PDF link annotation
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/7af950.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/jirega.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/60419232266.pdfIn PDF document text
    • https://xefesikixote.weebly.com/uploads/1/3/1/4/131437823/af41e.pdfIn PDF document text
    • https://cdn.sqhk.co/ketegobuto/edZhcgg/cone_ice_cream_machine_for_sale_olx.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/kigagoxagarim.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/5162717.pdfIn PDF document text
    • https://pajodutakimileg.weebly.com/uploads/1/3/4/4/134474341/47aaf24f812.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/dggwYjd/59660809722.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/how_much_do_emergency_room_doctors_make_in_california.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/uCohj7x/money_dashboard_neon_app.pdfIn PDF document text
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/b4596d9dc4fa560.pdfIn PDF document text
    • https://bitoxogosem.weebly.com/uploads/1/3/4/3/134386372/polasaxozar-lideg.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/zerejibixupav/huawei_mate_30_pro_stock_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/fesumuwujobozu.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/96077548648.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/depalusirurod.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/sufokawawugat.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_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 4948 bytes
SHA-256: 83d358a70ff4f1cd9fa2e1d482f3844e5825f21c1bc30fa2314b82116834e002
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 12280 bytes
SHA-256: f6a4b07936f0c0ffe0e912f38bbbb787f4a054fe6501083462003b7f6203c86e

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