Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5af83115fc7ca9a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 10:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2318d37ac2e56f2d8ea3312997491fdc SHA-1: fd01925c2bf53e8e07355af3367c71c361380a37 SHA-256: c5af83115fc7ca9ac63b8316791baaa74702dcc5d8ef92576f32c19c6306a2b6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest a malicious intent, possibly to redirect users to phishing sites or download further malware. The presence of 'utm_term' in one URL suggests a potential SEO manipulation or tracking purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 4

  • 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://icltindia.in/userfiles/file/mijise.pdf In PDF document text
    • https://underworldgear.com/upload/users/files/romodafojofibadefaxan.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/zeguxidobodutap.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/59887563947.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/46656432793.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/vuduse.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/3961169638.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/fuwegetamaf.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/paripudofole.pdfIn PDF document text
    • https://laps.pl/userfiles/file/68527175145.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/29466414529.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/loxelezazobenawagi.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/vebonejebibopiluwe.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/titunox.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631357526.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/29905126337.pdfIn PDF document text
    • http://360global.ca/userfiles/file/rimamotamajibexifuv.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210901060253_9g51to.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/48827067021.pdfIn PDF document text
    • https://10fci.org/userfiles/file/fojix.pdfIn PDF document text
    • https://camphacement.vn/upload/files/56043114477.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/80016976385.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/xomukirijenorirali.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/96097709423.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/76208813794.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/zotigelun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=english+movie+online+free+websitePDF 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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 17188 bytes
SHA-256: 9fa6b98820e89fb31f2a340bab921daa963501dca89c8b3064bd7be1f83837fd
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 10776 bytes
SHA-256: 3928316d73d195e2ad993737bcc6a341960aa731efd207c803ae131c539a4df2

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