Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de57d1b41371780…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 11:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fecdc8daf1b19d171734ab606dd9640 SHA-1: ce274303c989e25b0d394670add0a53a1db2beee SHA-256: 0de57d1b41371780181740dd9c7ba183448b0b11ec991eebf71a67ea15ca8bba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The presence of a callback phishing lure heuristic further supports the assessment that this document is designed to trick users into interacting with malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mannadey.in/FCKeditor/file/lidelubimimenipiz.pdf In PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/52535358337.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/nixewedagejoxinojama.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403496af364---95133189679.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/79227292118.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/fivizur.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/tujoxivulototamopakifani.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wizuzud.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/9800358110.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/28952211582.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/17113851996.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/jokafegijejazo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140767b2236a---8306487071.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/kojulutof.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/81509645015.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/relunevoku.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/powumede.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mufewifukatobedan.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/xesedakekexapa.pdfIn PDF document text
    • http://puisan.ru/uploads/file/busafubaworokolisapaf.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/lojifatifimovodepo.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/45216910319.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/96640447195.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/35395162995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+wedding+every+weekend+online+freePDF 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_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10940 bytes
SHA-256: 38fcbb928a1b85c435bfe960916ae58433272d06f52d4ad64ff3d9ae635f5a60
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 18660 bytes
SHA-256: abd2b4a55dc7800b23a907393383eb87b8053ff7570dff873cc049e381396567
font_02_sfnt_off000133da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1