Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e830e4c2878111…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 08:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e8d3d3ea1d21f93c184885f93b061ba SHA-1: 076553db060eb87cbb9d48e9459e4c6bbfe828d0 SHA-256: 49e830e4c28781116c779b6a9ebabbb8898bf254079ccd01c8fba7b4f742a4d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic reveals it is part of a link farm designed to host multiple PDF files on disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs point to various PDF files hosted on potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://0228339500.kad.tw/kads/ckfinder/userfiles/files/23669739805.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/17e5aec30601e4dd58e4bf662b1f8eff/28563198864.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/kidorinaxa.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210909_D659760585FB7B66.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/20452345509.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/gepowanepokanufetiv.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/38293552874.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/welisufo.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/70658439771.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614378baba60e---71585592375.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/sukawiniri.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/69342600480.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/buzopazirolikiv.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/86100422061.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/bojodanavaxexoladivule.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/27822840188.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/kilevefixutedibax.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/51995346043.pdfIn PDF document text
    • http://npas.ru/pic/file/zasomotosazaluzunaxu.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/97849852049.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/jojas.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/lusal.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/ranisamilorajaxugufolo.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/82019680213.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/goguzaveruxuvevadojin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+wallpaper+fit+to+screenPDF 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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 17772 bytes
SHA-256: 5a12976800a1c0b39a230d0f86a244785a1888261212575662951afa8fba2126
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 10680 bytes
SHA-256: 9ba91e5ada9aa5eee311f6ee5dcaab8e750baaa4baa4d4a468de6a07c0986ed0

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