Malicious PDF — malware analysis report

Static analysis result for SHA-256 835996c2f813f069…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 01:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40bed28d9b1e573f5421eb6d3556a85e SHA-1: 445f66b25307626bbd9163fdfc9e86fe2145d4c0 SHA-256: 835996c2f813f069bafd3a353fc7564564e15d9e4d8621ef0e0f351f81e6afb1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous other PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the suspicious nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lanaecoloridabruzzo.it/userfiles/file/23690003156.pdf In PDF document text
    • https://promise-land.com/upload/file/gekovavijigasumutemoku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab692df4c---57656412269.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/11049038410.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/dojogixibunogoraj.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/tojamaxu.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/dozaz.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/nojugirimemutukuw.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/tasomoxu.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/53871879495.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/wapivinenigopumojuxe.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/69778506858.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/91481281260.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/sajukava.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tinadefavesevusum.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/57860466841.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/fixevomoworodejerikofofe.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/14616614049.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/wizegolo.pdfIn PDF document text
    • https://grouptm2.com/contents/files/42614838636.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/juletezefofapokejixi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/506267d472fcbab83c1544a791d89d47/2898551733.pdfIn PDF document text
    • http://renknh.com/ckupload/files/26021365461.pdfIn PDF document text
    • http://allasclub.com/campannas/file/14214794548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vorgang+android+process+media+wurde+angehaltenPDF 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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 19312 bytes
SHA-256: f8fdc77e69427f74ec5d87c497650563b8c42f63affcf17edca8d6413151886f
font_02_sfnt_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 11116 bytes
SHA-256: 1150ee20c40ffc8ec0a53dc19c3d8523b99ed9b9f5a0e104863fa09f1dec647f

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