Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbbf19fd02d970e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 19:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: ec05b3f851ba813e9431bb7ac382d790 SHA-1: 635cb45e2827dbc2a5feb17f8b7758bb1ddcd176 SHA-256: ebbbf19fd02d970ef45cf5d337707fc8771b01e504c048f4689115f4c60a450a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://self-storage.sg/images/uploadedimages/file/zikitenugowesaweke.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/18351647760.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/69885172340.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/98521173925.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/90737014577.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/rujer.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/gukob.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/zezigugapowugaloxiwalemew.pdfIn PDF document text
    • https://maria-galland.ru/files/file/45945740528.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/tokumexexagivagawiviwofo.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/25382046290.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/wugovi.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/6015439839.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/jumelazoxosarovovefusu.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/63418447822.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/81368111067.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/dimilusepegosaxuwusos.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/76597512387.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/54013363939.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/63060126556.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/70663345923.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/nikarowesoxuwidovotilavu.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/fajututonemokomunifuviki.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/zuwiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=turn+on+android+phone+without+batteryPDF 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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 10676 bytes
SHA-256: b6c0f45cd8e90628513f729d63db9a9d4b206eebf1ea215fce8749e980e4269d
font_01_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 17804 bytes
SHA-256: 97c725bfb8c9f4b29a59efad5a727c78d34b78c44ae7062ebf58a24538f97555

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