Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe309a9428111919…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 06:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0db9ec1f4810083fab6de99d777bfa6d SHA-1: 7068f64017f85e1316873a1c1e7c30e6d6057eb6 SHA-256: fe309a94281119192962fefd571c58670143d1ed3c78532fc34db7e19f5424f0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rrr71.ru/upload_picture/filiwexivopegojoni.pdf In PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/zebowokozafite.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/kadusowepexalexenemanamik.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219181838586747.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/didixorozolixoze.pdfIn PDF document text
    • http://hijoin.hu/editor_up/30310016562.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/joximurup.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/1955246480.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/35192579455.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/latiwuzoxofipa.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/21459037557.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gazoxevinivixof.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613815254685d---sanelunukimunemute.pdfIn PDF document text
    • http://haai.org/upload/file/menulolaleperinu.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/penulozo.pdfIn PDF document text
    • http://biomehl.com/images/content/files/25443129612.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/56100865231.pdfIn PDF document text
    • http://zae.me/datafiles/file/mivuf.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc4bcb81dfc70e73076b330589729fad/majuvorixurozowege.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/47421832780.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/kolej.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/e99687ea0b01d23283f05bcd34e4dc15.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/65296828316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=custom+robo+arena+romPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 19504 bytes
SHA-256: b3958ce36394d445f9e5be2fedf283c2da413133bc80c365c7388d34c1a8c7ef
font_02_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 10400 bytes
SHA-256: 35e7e100393143379c4279199c72da0ceadbdda36648c017f885096f3d3dd263

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