Malicious PDF — malware analysis report

Static analysis result for SHA-256 50373d13869bd0ad…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 08:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 935a43dffc4264576c6b58b474434ff9 SHA-1: 7776e390376c6acd4803a307b0fa641fcb132afb SHA-256: 50373d13869bd0add285910ccf11b703c10ab31f9ffcde4b8d76786e5f35d341
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://rallstarawards.us/nbloom/fckuploads/file/wapubuvupixetovelezak.pdf In PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/garigomamataxul.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/3772433427.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210902_5480272402ED65F0.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/40394776517.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/zipusojapexatukedidelopo.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/zabifoxonilibubisigapused.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/81604456961.pdfIn PDF document text
    • https://migger.dk/userimages/file/soluwibixapebe.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/53532689055.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/matanepirede.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8121c6a8---21444648030.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nowaxumew.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/24973772880.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/biwumiwugejalisef.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/kusosaxofisudiw.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/88997766323.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c20898a687---mawegivovoxenaludepusiwof.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/wupovatarufarimasimotajuk.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/radosiwatevidujobula.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210905_34B53A427EEFCC68.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912192149605942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=imetric+premium+apkPDF 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_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 20004 bytes
SHA-256: 0559e4fb9bf5d750fee959d220986f2adb549d89989ef258f927577649b153d6
font_01_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 10240 bytes
SHA-256: 3106442a74973c0b63e18729f74f7e57ab3d8a5042f78f0dcaeb756681973e01
font_02_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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