Malicious PDF — malware analysis report

Static analysis result for SHA-256 68373b225f2b7417…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 22:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5e947965628702ec706649dac078130 SHA-1: a572f29f699f2c81912918945c92f07a7d4871d2 SHA-256: 68373b225f2b7417952990a3f783aa17d08aad99b9f70a041112fbafdedb6e48
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wrd13.com/force/file/73751288751.pdf In PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/60409473953.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/rilejazixupewefoled.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613301f5739c4---tetodepaji.pdfIn PDF document text
    • http://lecostationery.com/files/file/zixoganokamixuvaligemij.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/61044134321.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906210824.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/vunakefowipavumib.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/36246621731.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/26676663414.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/99875350350.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/64267799620.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///zufofar.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/duwom.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/78119755011.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345e8995a18---50134322750.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/pukuxeninobevegobub.pdfIn PDF document text
    • http://www.heksan.com.pl/file/84123184005.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/loregotogosepa.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/17073966637.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/dakosotenim.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/ditufe.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/91233872587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=calculator+apps+for+androidPDF 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_off0000b923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB923 10612 bytes
SHA-256: 9678962f35a0d201b5b99585614f6388cc122e935967d0a1b59b783c0757eea4
font_01_sfnt_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 16084 bytes
SHA-256: d16538ffb0803d937d16853ad703098bcdd0d2a905d257b05587edc7a0578add
font_02_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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