Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff08bd7a7c5edd7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 05:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 167b8787b55bcff1f0484ddac92b1ed0 SHA-1: 514d8ddd5284f043bb1334847c13e3dd61c1978d SHA-256: 6ff08bd7a7c5edd70befaddf2e922b3e773096b7222040a11e512061dfea1f50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vet-arrighicolangelicristilli.eu/userfiles/files/pososomonidapanurixebuvi.pdf In PDF document text
    • http://ltmetal.com/userfiles/files/tapavixurawu.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/gorilanojutuxusiwudorev.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/fomolina.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0b4be3e---8303829873.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tofitesenede.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/57250502396.pdfIn PDF document text
    • https://felicityokolo.com/file/52140951500.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/zofedenowakixabaxeg.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/xogobimaxuvodetujoredudu.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/rovelikibadivawudepus.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/womitexefufebejorej.pdfIn PDF document text
    • http://vlajamo.cz/images/file/gefezopagubudepuv.pdfIn PDF document text
    • http://apcmagon.com/userfiles/jovifadaxosiki.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202192124824032.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/sobalujelawetabubun.pdfIn PDF document text
    • https://csn-alliance.com/data/files/64266369203.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/52987456602.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161366f62e02b8---87735788389.pdfIn PDF document text
    • http://hbaoge.com/upload/files/60032770997.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/zebawopivoruz.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///sumefazumikubudokibolivof.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/78029052920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+keys+in+subway+surfersPDF 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_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 10452 bytes
SHA-256: 5c27ce06af9a71997e040aca79da86186913866c035b755d7e18ea0036441254
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 17852 bytes
SHA-256: da2b53d6f6ddf3f9b720677331a17179407fdebc05394bb579b68f0c977d619e

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