Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24eb28038d4c30f…

MALICIOUS

PDF

72.1 KB Created: 2021-10-02 10:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 183f17cc428f7d18b7eadf5e78fcca77 SHA-1: 4a36915880cee1003a6111234b8a12d70029d4a3 SHA-256: a24eb28038d4c30f5b0cc0bccaf307b78920b9513cd7685a370ba5884ad0b32b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the PDF's purpose is to redirect users to a collection of other malicious documents hosted on disposable domains. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=complex+analysis+zill+solution+manual+pdf PDF link annotation
    • http://www.prodomasa.com/ckfinder/userfiles/files/13705235751.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/telomatoxetotawipixola.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/7397657263.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/newisopid.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/51250155324.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/vizavafimaxarijimir.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/72388891396.pdfIn PDF document text
    • https://adikkedua.com/contents/files/53546131185.pdfIn PDF document text
    • http://usateatop.com/_upload/files/83183534681.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/tivux.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/dupokoputu.pdfIn PDF document text
    • http://cosyromania.com/media/file/54929254494.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/60232569457.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/lozogogurilumideweji.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/27538643629.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/nenivofesidojum.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/fuzanaxudim.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/ketufi.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/tofesiwonovakawefa.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/gipanuferek.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/71202475584.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888bc29d86---28176820089.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/madekapavepez.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/70405879879.pdfIn PDF document text
    • https://cope.lk/assets/media/file/19554570895.pdfIn PDF document text
    • 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_off0000b420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB420 10964 bytes
SHA-256: d0cbbd77beda9b1105b5680bd115e9b349965931e5557b51a9685c50836fa138
font_01_sfnt_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 17368 bytes
SHA-256: a3332d856adc9ca373919f2f75ddf7f5fd96605cb0a2ad9f3a41f4f1435dbe65
font_02_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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