Malicious PDF — malware analysis report

Static analysis result for SHA-256 29dba8635be868f0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 16:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a09ad9a7067a02ab89acbe28d6f185e3 SHA-1: d31a5137757bb70f05d1356ed80d0373ba30fb00 SHA-256: 29dba8635be868f0de71fb837fe462109fb9e73014452f8695b349de65bd4167
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://projekt-lesen.de/userfiles/file/35173999129.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/66e64e46c9139677df3b7546773eba1c/71634949391.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/guziwatun.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/pifevuzenikisomikafud.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/tolupakebidemo.pdfIn PDF document text
    • http://pronobile.com/catalog/file/60530165401.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/lexuwunovebiliwaka.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/xigetijifozuto.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443dcd21fb8---tusetisatipu.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/16217022080.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/96547152488.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/19976998870.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/65168292794.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/2144394947.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/20194324045.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/menejafikaj.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vunudosanixedate.pdfIn PDF document text
    • http://446888.top/userfiles/file/ziponogipatatizapebeb.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/siwuvusep.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/sorasiko.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/19540714809.pdfIn PDF document text
    • https://htchninc.com/d/files/2790605320.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/gesoreginifod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dazz+cam+apk+androidPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/mawekitifuwixut.pdfIn PDF document text
    • 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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 18716 bytes
SHA-256: e69739dee52e81d3c312285b7f124bb4f843f8feffed71691e242f536a8f26c2
font_02_sfnt_off00012a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A99 10384 bytes
SHA-256: 66fc0825eccf949f045d7dd747299225234c2e1f7d87f4dca037ac9f057f88d1

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