Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e9bd9ea7b161c4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 02:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50a2ce6edc760ba7c17f51d035533946 SHA-1: 5cb6b39c71f0d6f34031611ebfa43e597ab9011d SHA-256: b5e9bd9ea7b161c4b24b4b3d0f1e8a50c466467122e8c9ac969a5d8239ee81af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links pointing to various domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=jake+paul+fight+how+to+watch PDF link annotation
    • https://tonmathunglan.vn/upload/files/kowaxup.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905070634.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/sabaxumikowarax.pdfIn PDF document text
    • http://actinq.nl/upload/file/tipexefitujowu.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/bemedunonivukulaven.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/35213717355.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/fipakawidugukilape.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/98407488533.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/laputoberujaf.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jebinakuruwupekalaran.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/jigusefojalelezanomo.pdfIn PDF document text
    • https://windsbs.biz/files/file/kegefub.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137bee29b5e5---katuliwexedi.pdfIn PDF document text
    • https://razredna-nastava.net/files/86228847334.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sbhhnkkogmvas0nmsl9ev1unme/82564699254.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/tujufataxifefim.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/93473093046.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/37344235246.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/kuzibesuwakotu.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/79032171686.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/23618608162.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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 10656 bytes
SHA-256: b75d4676c93464c596955c5aae36d3ddbef7d00ccdacbbc0e8b9e873e596ef57
font_02_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 17912 bytes
SHA-256: 009e2b4fa0eadd5909560d67ded967360f0ae044871a8ebebd158eca58866dd2

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