Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed65244114e84bd…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 09:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 94da86ad9398b3c75d17405f7d05d291 SHA-1: 1b93b4d6d11c3f0d02d2652c1b7beb23cda966dc SHA-256: 1ed65244114e84bd84b0529f02fc4ce4138fda52e297aa44789d8bbc46445239
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malicious content through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://alarmy-kamery24.pl/userfiles/file/visusox.pdf In PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/87351179268.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/gazoruzokit.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/xalafef.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/fidatanoxixib.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/41929233251.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/fotogezi.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/66575708417.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/24450247975.pdfIn PDF document text
    • http://synfarm.com/upload/files/30292712246.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/92195969612.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/muraxifotasaliz.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/kivakenurizajusex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=usb+camera+android+not+workingPDF 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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 17516 bytes
SHA-256: 8903ecf54ca926e82f9f97e3a459e457ec262a1a1e837fa530e294b31ac2eb7a
font_02_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 10992 bytes
SHA-256: 23cc51a862773b643e3a701cb49f3b2a95bc828ec0b461176743454b93eaa23e

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