Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f4b033b7dc0351…

MALICIOUS

PDF

65.3 KB Created: 2021-02-17 03:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6476227cdc2a1fbe5508a2a1be02ec4f SHA-1: f337ddf557d5da5a9d12b185d90c1eee7a36cbf3 SHA-256: b7f4b033b7dc0351a7973672c22688e041a3c23c9fdc67e972a1be617fab5e59
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URL points to a site that appears to be part of this link farm, likely serving as a lure or redirector.

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
  • 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://leonvi.ru/123?utm_term=how+do+i+change+my+casio+fx+300es+plus+to+decimal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416802/normal_5ff9264bbc5f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5fdb418720869.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/6vigjba/petazaruxuboda.pdfIn PDF document text
    • https://cdn.sqhk.co/kusonemap/nheVB6T/kbs_kong_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/Wjjibha/60842793965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_602c6f61c2d52.pdfIn PDF document text
    • https://cdn.sqhk.co/tizesefetus/PwdjeKT/45504204376.pdfIn PDF document text
    • https://laxukiwu.weebly.com/uploads/1/3/1/0/131070933/2ac6fc9.pdfIn PDF document text
    • https://cdn.sqhk.co/bomikiwolug/Vhjhd4m/zugovopavoduneki.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/A30ibBi/mountain_bike_racing_game_download_apk.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/tugurejuxoxis-pidadujuki-taxili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479684/normal_5fde3ef48c9ea.pdfIn PDF document text
    • https://cdn.sqhk.co/nivabetaz/jcRhemi/movusinug.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/HhTjigj/lyrical_lemonade_jordans_nike.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/jhijecO/dagodeneremuzujefijufuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lelekon.epizy.com/updo_formal_hairstyles_for_long_hair.pdfIn PDF document text
    • http://zanutebuxeboluv.rf.gd/bunnings_gyprock_sheets.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_off0000bd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD23 6000 bytes
SHA-256: e4468e1c95ae3cf1fd76a884a5393a02f10b168370150a7436cd0f945c3b6fdb
font_01_sfnt_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 11128 bytes
SHA-256: 8016904f7ed8589fc397e9aa949b518f35608b58eb4153ca3881f1b04ec4ff1d

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