Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd9744b6df1fc3a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 09:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a21d143dcfe85211bfef7348b659c0e0 SHA-1: 3879b406bba4eba6ff6164c3c943de8e25e546f3 SHA-256: fcd9744b6df1fc3a2ab72aa7d61c4ddfd88d9067c473b09c50fec8e07835d92a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, and one heuristic specifically identifies it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=dopdf+for+android+mobile PDF link annotation
    • http://labonscafe.com/userfiles/segaxatijetabovoxi.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/zosibavilumotoziliwa.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/33621775446.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/sagikigemavogegasugaba.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/lixiruf.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/gupogotakupavilugibapor.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/35045449441.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/5500517492.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631432794.pdfIn PDF document text
    • https://festacontinua.it/public/file/57524210656.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/32245495653.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/2182682371.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/48336360459.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/83952252660.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429fc172488---39127312601.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/44281657900.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/14296118118.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/8322129448.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/noteregagoguwame.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/delejebidelazuzujebo.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/betamumele.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/99023357346.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef02a564f---vurowesovob.pdfIn PDF document text
    • 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_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 17184 bytes
SHA-256: 1d27c4b700b665df0846bbd101b72abccbd91a4a3bbedd038df6e2fa6e5fabaa
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 10532 bytes
SHA-256: cbc6741ab943a61e6bb69745b71984c05c24827db073f73143aaa0cec3eac4c4