Malicious PDF — malware analysis report

Static analysis result for SHA-256 593e227648efc2b1…

MALICIOUS

PDF

63.7 KB Created: 2021-10-06 03:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ddefe5d42f296f2602f146150b8b8e3b SHA-1: f128c58ccfe37714f73d089aeca8f6400ae1ef95 SHA-256: 593e227648efc2b1298055b6b40f86aaaf467096745a66090dc28001b9a06442
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a phishing or malware distribution scheme. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9183

Heuristics 4

  • 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 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 https://sergiomauri.com/images/file/sasifubu.pdf In PDF document text
    • http://nicolalazzarotto.com/userfiles/files/kozufesiz.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/zovatijanuxowidip.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/popod.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/walatavisuzak.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/lizase.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/sinekikidira.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/lopirosuzifero.pdfIn PDF document text
    • https://filetorme.com/upload/files/90274875945.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/43520199804.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/78298867916.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/kamaxisavudepaxude.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/nelavisi.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210924110146.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/66802455012.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/35883891531.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/13056110607.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/52509831727.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/74900126877.pdfIn PDF document text
    • http://xprchemical.com/upload/files/boturinivarowifef.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/fubef.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161529df9bab76---gukibedixipopelifid.pdfIn PDF document text
    • http://pneusmarene.it/images/file/josirikunuxubiliz.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/41028048934.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/nebodojeluzexevagoropojob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=most+popular+music+by+statePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 17400 bytes
SHA-256: 383f87a22982e273451cd1b76f45922cc41d77075c884733d1e75e01824a317a

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