Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9793e7b28fb8d09…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 04:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f74b3fbc0f22b70a39bd8f0183aba190 SHA-1: 1df945becea305b4d826e13760bcf9a0a7d1ada8 SHA-256: e9793e7b28fb8d09c09100c10b95342b7f9baa585d932689d4d43fa06fa8f5ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://dreiseengrundschule.de/files/kewizajimavuvuzumenozu.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/26448112370.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/kenutozivivizafarapezej.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210903_19_4_56.pdfIn PDF document text
    • http://babamoleskine.com/files/file/zejatadasapapotonap.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b3a8d19c4---1750751188.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/rawusukeridafujuxorewuwu.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/99876553704.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/68460806939.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/15779612970.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/9994995411.pdfIn PDF document text
    • https://rubfila.in/files/file/lulojefuxaxe.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/lunuso.pdfIn PDF document text
    • http://itena.si/uporabnik/file/pagapifomisawakerukagur.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/39204214567.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xomitufej.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/37760256414.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/39605498767.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/muzimejabejuvikoxu.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/87504580744.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/penobiweguw.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903130110.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/gedalafoseziber.pdfIn PDF document text
    • http://freestyler.cz/img/file/49939383635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=car+games+hackedPDF 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_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 10480 bytes
SHA-256: c823538d29a60e6f9b4f7bc890e8e96ef06b986320dd292c70a460569796398b
font_01_sfnt_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 17396 bytes
SHA-256: 12d45aee61695fbafee0bc9f22304dd578f3ddeab9a994dc8a7feb9411c3d2f2
font_02_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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