Malicious PDF — malware analysis report

Static analysis result for SHA-256 e343a298e8f5dc49…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 03:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 94e04438884590e64f80edfb04f2722f SHA-1: 7b604b4d4b9182c027389ce3e002cf8020b378eb SHA-256: e343a298e8f5dc49f45f2256355343f9956c73ee7aadf00129009bc6cea6bdc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a distribution or phishing campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a network of links, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/89897298923.pdf In PDF document text
    • https://duongthuy.net/userfiles/file/nalalizurap.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/ranawo.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/47349363641.pdfIn PDF document text
    • http://hkacca.com/userfiles/lefefoniwekajapevonobe.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/zeripowavin.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jadozomitukotojikokexo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd9969c6b1---torobizemavi.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/xuxaronedow.pdfIn PDF document text
    • https://wrd13.com/force/file/kifofuxipudetuvatolefegiz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/11434075909.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/fogefanosomazolajedepamif.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/forusuwofew.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/84170353985.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/52875986805.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/xuguguwawamutemun.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/biwad.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/wunufijepejimilazif.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/94830172489.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210920150520.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/bagejerezurewuwebepupip.pdfIn PDF document text
    • http://klaaswester.nl/img/file/59415265215.pdfIn PDF document text
    • http://effekt-film.de/files/file/gavorag.pdfIn PDF document text
    • http://wych123.com/upload/files/36881165052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=think+and+grow+rich+free+pdf+bookPDF 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_off0000bb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB41 18052 bytes
SHA-256: 4981fac3841bb440f3d0df605e0df2882c458ab285db2394ecef3716748d7039
font_01_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 10868 bytes
SHA-256: e8b04fd30a5556d9c3d9025b88a738b0e96795af5d87f17dc6a7287f7df16108

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