Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2234fae59b5e950…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 03:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0140bf35b948c7a8e238f78c74f4a3d4 SHA-1: 7322dda267c6509d2747b0a45191f09a051e75aa SHA-256: b2234fae59b5e95008f893ff61303a0bae20f87ebc2d565b60247315af75c281
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an AcroForm button with an action trigger and multiple external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely a phishing or trojan delivery mechanism. The presence of numerous links to disposable hosting and the 'link farm' heuristic further support its malicious nature, aiming to obscure the ultimate payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=doraemon+gadget+rush+mod+apk PDF link annotation
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/wibizasubila.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/zarizurevepexivijako.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632351057.pdfIn PDF document text
    • http://kccmaul.com/files/files/woruto.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/sufudowu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3e89f30a7c0ec3f2687a273c47f65435/lalirerewuminowime.pdfIn PDF document text
    • http://palami.by/images/file/bavejutidibarupelimutuw.pdfIn PDF document text
    • https://samudra99.com/contents/files/23515919985.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/55918519025.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/73138994725.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///zotufurokeroda.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/87374187627.pdfIn PDF document text
    • http://bndweb.nl/upload/files/30576605144.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/panogirivuribosesidope.pdfIn PDF document text
    • http://spiregene.com/image/files/20210908_015105.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/55413493220.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/14188753347.pdfIn PDF document text
    • http://atek-ent.com/upload/file/getutoxezadovomijixikipiv.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/fijufubiwut.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/69748753574.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba860c3f17---munemodu.pdfIn PDF document text
    • http://trubaopt.ru/content/file/pexoselofu.pdfIn PDF document text
    • http://tzsunup.com/upload/zowekigapotewipinesif.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_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 10892 bytes
SHA-256: 3e9c9a239daa284db5fccdb5db6fc5c8a0427b5f22a6c4a5bcf69c466a7366cf
font_02_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 18228 bytes
SHA-256: 6d8b6bc4fb3787165c289edbbabd7da0b412b407f15c26a57890e28ac449a1a9