Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c1901cce74e227…

MALICIOUS

PDF

87.4 KB Created: 2021-09-13 20:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46eb1e1249dcc295109adb39953706fc SHA-1: 22f625e8ef3821a9b3755f33fdc0a0d2eb352878 SHA-256: 87c1901cce74e227cd2d91062d92a8db5f84494511552eed63d20876aa5209e6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of multiple external URIs points towards an attempt to direct the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oikoscoccatoarchitettura.com/userfiles/files/kupixodexuxulebixepopime.pdf In PDF document text
    • https://full-flavors.com/img/Data/file/vapibanuvinimemab.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/fefatataro.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/keruda.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/miderijugijuzutibibonul.pdfIn PDF document text
    • http://mamam.by/upload/File/file/44130834727.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/70469584622.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/kudapagave.pdfIn PDF document text
    • https://ka-base.no/images_students/files/21760180572.pdfIn PDF document text
    • http://showdoimovel.com/files/files/zitogopunaxol.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/33125785362.pdfIn PDF document text
    • http://calisnt.com/uploads/files/83573134460.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/75010757590.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/35132050645.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/70580876971.pdfIn PDF document text
    • http://mopron.ru/upload/files/vojat.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9b4826c9---78631518525.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-2/20210902224720901985.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/ruferenexosom.pdfIn PDF document text
    • https://posh.hr/files/23848848476.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/mebuzaroziwuw.pdfIn PDF document text
    • http://hanauhrova.cz/files/53053843537.pdfIn PDF document text
    • http://marketingnews.fr/images/file/gilizanusujow.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210901102459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+android+data+recovery+toolPDF 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_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 18204 bytes
SHA-256: e3a1eb9804047d0a37a034a8565394bbd72a024bb1ad82058216f2497d05a8d5
font_01_sfnt_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 10352 bytes
SHA-256: 8480fc63a526d3d1b033c486e8c67dd857de6a11c947389fb4c4e54676dcdc7d
font_02_sfnt_off000137eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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