Malicious PDF — malware analysis report

Static analysis result for SHA-256 04326b027002d357…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 04:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82becd383fce1e117e48caec555c33e6 SHA-1: 4398c3dce688170c73a9562c01998d5ae9c64754 SHA-256: 04326b027002d357cb30970811085ea78d3a4e96fe8049dcd52620478fb25b79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://thietbimaugiao.vn/Images_upload/files/72194889393.pdf In PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/67145771320.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613859905a63a---xudapofejebiminazefeja.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/21189818823.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/nofesomerilujo.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/modifunegiwasutifekedatan.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/gufawanu.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6130b4cb378fd.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/42430183348.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210916054612.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140f42d689fb---momomedeg.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/nolefobak.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/29440677224.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/56442519240.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/moxulile.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/38498425795.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/xiputejekiwumevit.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/9128236900.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/84155168783.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/najetixilamevisi.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/30539343564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dnd+fillable+character+sheet+pdfPDF 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_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 10736 bytes
SHA-256: 4f7470169db7a17cbbfba2b76eacc9a184a5cde5e02da145756b832b86a230cc
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 18692 bytes
SHA-256: 103b9e52e24f5a3655fbcd8ab6f564370ce040ead76bd1b82c8f640c7f65bf5f
font_02_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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