Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6344b38508afe6f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 06:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 137c2279e0ba4c4f5d63b1113afe03c0 SHA-1: 731612b5aa250f13139808e9b25649eb1f4017e8 SHA-256: d6344b38508afe6f8105dde1b2566fe63223c2dc885e1b59c0b8b4cf3e14777e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also includes numerous external URIs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://avsa.org/sites/default/files/images/files/fogemi.pdf In PDF document text
    • https://agape4u.org/userfiles/file/89719493074.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139e66165d24---32327924314.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/42315293514.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0704d2c3---56694392308.pdfIn PDF document text
    • https://fond.ru/userfiles/file/mefonusakobesogunowi.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/86386734752.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/33889219438.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/66959191301.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/56251698526.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/gedikawerubisoramila.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/64140199703.pdfIn PDF document text
    • http://boki.hu/editor_up/23431215273.pdfIn PDF document text
    • http://ossokahve.com/upload/file/nadifinolujakazeduvadazej.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/vogopeboxiluwib.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/16187964532.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/midemekowubajesidadunapo.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/53456017322.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210915_153829_3721.pdfIn PDF document text
    • http://rsentco.com/upload/file/96041974042.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/84506177598.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/34550946348.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/20126998879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tv+channel+apps+free+download+for+androidPDF 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_off0000b5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 10736 bytes
SHA-256: 14b3de267cd22a046c6c0526ccc3a329eb8f96fbe4688b761e6fabd119f548ed
font_02_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 16904 bytes
SHA-256: 7ef80976b3214c6df71c146c39a67b305c9f4a6fe2ad5531a7a5f2d2471f3d89

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