Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa9607befb5eda9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 11:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 154bd976a034fbf8b498d0bf600604ba SHA-1: 6b970dc88834bd8fa7183958920b5521a7254b89 SHA-256: 9fa9607befb5eda9277089133073ec0b7df9e2143abb4fb99b498f2e9e655e6e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of links to disposable hosting, reinforcing the phishing or spamming nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=rupaul%27s+drag+race+all+stars+season+1+watch PDF link annotation
    • http://exima.kr/userData/board/file/68017647275.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/186991412461329c9763ace.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/nazev.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/xalusilukototafepuboxigoj.pdfIn PDF document text
    • http://sin-hua.org/userfiles/38602612969.pdfIn PDF document text
    • http://it-hair.com/userfiles/rumaven.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/xemekaruvi.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/48191986080.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/piganitavexupefunigiwalij.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/74878804921.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/29739740410.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/56045960165.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lifopugarebavujuxi.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/90534212990.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/36539861652.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/54620338342.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/31699212293.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/32811507039.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/98976603867.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/60403030366.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/10600434343.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/gitopivugupi.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/72104089633.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01A 17684 bytes
SHA-256: 83c8559d91fddcfebb894f9b04d0eb822db9ee64712ecbe5443deaa25df05a75
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 11020 bytes
SHA-256: 96d793e792cdcb3b5e6d25fa407d9ed459b54c8598dadd588af863825569e6cf

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