Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd9f92796104200…

MALICIOUS

PDF

68.0 KB Created: 2021-09-16 11:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e03822d78884ee0d949a2b4613287e17 SHA-1: f5e39f96df92d9c4d1a961b40bd0e17f2ad746da SHA-256: ebd9f9279610420047d7abfd607c7968711ecdde095948bc496cf977c98837b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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 http://micronforgacsolo.hu/UserFiles/file/sidogo.pdf In PDF document text
    • https://pmapmc.com/userfiles/image/files/wowewos.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/sutazam.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/newagutonivatob.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/15269958621.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/69082454160.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/xodoruwefi.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/40438729431.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/bodurelefako.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/sefuvibejiwe.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/88201998210.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mevorajufoxunopoxewogu.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/pekuvemuxipirowom.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/55662712824.pdfIn PDF document text
    • http://findusafranchise.com/files/files/41830688085.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/fevedupituwakijuziwaj.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mp98d695lhj696b1sa3l3mp0k1/14706171010.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/59179700546.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/86192575988.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/60088234095.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/zusamuga.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/39490319822.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/19107206374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vlc+download+for+android+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_off0000aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 14912 bytes
SHA-256: 86010a884de37ca809243646a48b391faa8fe9b397cc4d6dd52bf79a23df875f
font_01_sfnt_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 10360 bytes
SHA-256: 4e118bda2bf6830e86f367cf74fefe07c56c0be651827f1c9436098d40858762

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