Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb78871d5f5b840…

MALICIOUS

PDF

68.4 KB Created: 2021-09-17 18:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ef9732708f760a378d4881f07798118 SHA-1: eee07883a3c657d28cd3da148df9c88682409aeb SHA-256: fbb78871d5f5b84095218aff9ac72cc5ce4a8c33cf55c75a9233801dbd5e454d
146 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic PDF_IMAGE_LURE indicates it uses an image to hide a clickable action, likely directing users to one of the numerous embedded URLs. The presence of many distinct hosts and UTM parameters suggests a campaign aimed at tricking users into visiting potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 2 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 http://nissanotogovap.com/uploads/images/files/solesewogegiditapude.pdf In PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/8500389969.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/28352867114.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/bibuko.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/65117210952.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/54833334825.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/15958614305.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46498499080.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/balotununijesedufida.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/63268541310.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614175be51979---nudovejosugikef.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/59031464993.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lotaxixozeza.pdfIn PDF document text
    • http://secretinvitation.net/images/files/tatalowenotakuzeluribemu.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/zatiguvarolisawibide.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/wasefezevavol.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/3276168410.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/natuserunevikikogozevof.pdfIn PDF document text
    • http://billsky.ee/files/file/88288170562.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141641faf0dd---35042037926.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/xamasalegamo.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/87365604179.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/tobaturakupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+check+download+history+on+androidPDF link annotation
    • 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_off0000afb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB4 14148 bytes
SHA-256: f25828dd6d59f97108d4facbffbc275fb1e74cfc82c0b6b1c2f00bd8408775b9
font_01_sfnt_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 10752 bytes
SHA-256: 1081aeb59e7afd48f835fec5d9491a55df3eca69482e9f504be94fc1e50f2377