Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead90af14aeb18ec…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 06:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d7443646ce39b8024769ac6235712eb SHA-1: 6eb044dc8f35089779c4cd318df27d298d2d7824 SHA-256: ead90af14aeb18ecfddc5205ccb59a8e7ed212170274be4ca5f764549549f08b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous links to disposable hosting, suggesting an attempt to obscure malicious destinations. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gabinetortodontyczny.eu/userfiles/file/44129942873.pdf In PDF document text
    • http://iccjsc.com/images/uploads/files/fipizalisapawotup.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/kefezizejiz.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/71251499399.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/23370849114.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/1468654919.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/fuguzubamepot.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/naluzivexexepawisip.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9025312491.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/zuvazovagav.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/9901280856.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/witeferuxe.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/4281493824.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/94205129192.pdfIn PDF document text
    • https://phm.vn/upload/files/vabutemuju.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/28215520245.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161344699ab70b---nulovogub.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8bf1a7f743b93a54a4016db543660a92/35441836196.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wafodutefofin.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/zoxabor.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/todajutipomu.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/14436576042.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/xaxanasisipefe.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/jitefunefusu.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/tuxusavalitekam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rinominare+foto+androidPDF 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_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 10344 bytes
SHA-256: 528db126e4f2a17fe6ba280d7dabc5f2cb6e6f60999381c16b8ce00416fd56dd
font_01_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 17308 bytes
SHA-256: 3dc7084b3acfa128aacfe51843eade702c453da2f840cdb5c23c9343b68c614c
font_02_sfnt_off00012b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1