Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78e04534274c000…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 14:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: af9be351f23533e0b9b4a75ad1de09d9 SHA-1: adb3544e76ce0c865e545a5eb9f61e6f6b8bbee0 SHA-256: b78e04534274c0004fca0a77a0815f13737fa8669fa14ceaecfeb629c870dd35
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://omprintandpack.com/userfiles/file/tozodar.pdf In PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/42687861688.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/gujajefunumeda.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/muruvewiteluferu.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/55570980568.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/zaguwuxokivujapejagasib.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/51045144921.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/191da2da6993648a1ce367cce5f445db/59225609196.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/11652496798.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/padavize.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/4399290630.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/1983226948.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613312c8ea477---jofivaxibopu.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/wuvumi.pdfIn PDF document text
    • http://rubensova16.cz/files/file/68263774635.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/sesofitofozim.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/23769713177.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/96281487028.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/69269354157.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/wujibifinu.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/volivataxenebarigudaka.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/20014179996.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/depuxeg.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/noduzuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watson+glaser+critical+thinking+test+pdfPDF 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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 10984 bytes
SHA-256: 5806d87c6c5927f320f12b5992086caeea1814f878005c2ccb6768b9bfd6a396
font_01_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 17880 bytes
SHA-256: aa8d17a0281796fddc1497cf46218cab95f9440704a1278f782bfa310bad5dcb
font_02_sfnt_off00012b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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