Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfbff9bfb9e0900…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 18:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2afc4ce03d725cfd12a0d41e0f447cdf SHA-1: 4d17faf313b66fafe6c73962b1e28ca19d04ae7b SHA-256: cbfbff9bfb9e0900ced2c5d53561e151a3e6b530df64afbdc78bc29f2ef16d7f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a typical phishing setup where a screenshot hides a malicious link. The numerous extracted URLs suggest a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://pistant.ru/uplcv?utm_term=pokemon+heart+gold+soul+silver+randomizer+rom PDF link annotation
    • http://alphamarino.kz/images/news/file/70748188945.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/37265943774.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/7023024706152b04befd13.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210905_223502.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d14b7d94---79508741765.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/vimetuxukafegul.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/7044674114.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/sapoxazovakadeludajedo.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/zibapegif.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/21665593180.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/duwefivov.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614824fdd506a---guvezorosazanam.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/69650027654.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210907041325_b5yn2o.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/jasiwa.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/87607117468.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92525780369.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/52547225463.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/69346177668.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/xuvojabowodo.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/vojew.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14711637494.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_off0000ac1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC433 11016 bytes
SHA-256: 4412d3e17ddbfa11d17235208d9563f8ab56447c2f03f3c843dfc1f3b1715bcc
font_02_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 14448 bytes
SHA-256: b80e37f4ad7ca6e9db60823bd37bc8c7799a41cfa4799f228ecc578af1b6b3f0