Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d19d7f0104716e1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 23:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 698e6201deea7ae77f7f536c5599908a SHA-1: d02e6bee4767c755dc28256910efc550bb0393d9 SHA-256: 5d19d7f0104716e1663ea96f9a9239d394ef369d76501ee94250529ddf5d3f5e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://isabellepieman.com/userfiles/file/74436632766.pdf In PDF document text
    • http://teamhead.net/userfiles/file/60788172467.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/fudawiraleworavugabi.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/nenepafapujag.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1187eddd---narawizufaxuwusita.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/zedotekabozutil.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/mupopiletojujebawigunosin.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fujowesedumakuzaru.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/15161183236.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/xixifenijo.pdfIn PDF document text
    • https://clubon.top/uploads/files/95934995706.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/47628856999.pdfIn PDF document text
    • https://endobible.com/userfiles/file/23195425535.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/jexar.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/31580695878.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/xemetemugezixapuwo.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/muwosapesufebone.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/27664219756.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432238893df---wateguwegikixeguto.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/vibufomada.pdfIn PDF document text
    • http://4yoga.by/pics/files/masulo.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/42870965246.pdfIn PDF document text
    • http://shopabrang.com/images/files/galugokipe.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/vefakikexowixirasejanaluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+coins+tennis+clashPDF 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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 17780 bytes
SHA-256: dc074e48b7d2ecac62a5aa12271d630376cf43f3ea9b30eabeac7f5c33878cc8
font_01_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 10304 bytes
SHA-256: 94b0631dfb70e54685475157051677333ff62433eda06047ee58a6779546a8fd

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