Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51c58b59741fd10…

MALICIOUS

PDF

66.8 KB Created: 2021-09-08 13:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 498d9b02672c2d064ec6fc6e76f92e6f SHA-1: 2b73f76bfc29d97ca407ce392e757d5067a684e3 SHA-256: b51c58b59741fd1039593f2414bae1109c58c8efceaa39b0ebc546b312deeaa5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5834

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://dungcumaymoc.com/Images_upload/files/96131129412.pdf In PDF document text
    • http://suamayin.biz/userfiles/file/sevinig.pdfIn PDF document text
    • http://chongros.com/userData/board/file/50813795849.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/wurezowoguseruref.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mch3bhhbgok8sed0ka4grvrodh/37559784251.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f69e924353---lorelufiwoxesirotol.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/18648862692.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/kujak.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/famalisegezutesadomewali.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/miserujej.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/popuxap.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/32112564211.pdfIn PDF document text
    • http://edeins.com/userfiles/file/63020423520.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/fifamujerovepimuwifesunu.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/rexilidivijagujig.pdfIn PDF document text
    • http://195exim.com/datas/files/32601484971.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/wopikakoxesepudoxujibu.pdfIn PDF document text
    • http://na3.it/misc/file/68355983606.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/nuvufazepukugatupe.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/vogutap.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/84260600671.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/89592951743.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/51619977755.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210903022302_64910186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kingsford+charcoal+water+smoker+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 11192 bytes
SHA-256: c47765045cb01d810e8780b4e56b657d5361c150dde05b7d197563ccf4185065
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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