Malicious PDF — malware analysis report

Static analysis result for SHA-256 3536165fc9fd8217…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 21:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bdef91dc54d160c38db674acd3b14f5 SHA-1: 041c7224a9346d0c9063bb697230da8174c38c0e SHA-256: 3536165fc9fd8217b84732c612d7f8c7ef61bc6be86b8e94b854e13d0e4033ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate this JavaScript is likely used to redirect users to external URLs, as evidenced by the numerous embedded URIs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/66367235510.pdf In PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/jufawabivawuvivanir.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/39932937412.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/36453470449.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/pebaposisijam.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/86438361031.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/sifisesuten.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/gipepimasuvabijijozelev.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/novizud.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/37435625036.pdfIn PDF document text
    • http://rapet.hu/files/duzovom.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/lazenolixudolazomezatafov.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16136e360bbe8a---12432262459.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/fisorigozubisazulikes.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/jonexupezalusik.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/wojuwaw.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446086e94f1---doxilulufijofipanisopota.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/22021478117.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/74374859202.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/mobomefadezegenule.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/1290790033.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/68557110518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tubidy+mp3+music+download+audioPDF 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_off0000b405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 10920 bytes
SHA-256: 5cbe4da23f22ab23ebccb37f25062e694f59d3126a3f070d4ff27b21eacf1845
font_01_sfnt_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 15436 bytes
SHA-256: 39e635a082a96d2dee00024f4b4a6b4e78e9d2de832c670eeba380aa837334e0

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