Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca3d4f11625cf15…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 16:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dad14a35ccc70e55f1d21e7368934415 SHA-1: 167adff17029727f4322310f65362e39ca069ba4 SHA-256: eca3d4f11625cf153e7fd5b22b2a9c1c6603fed4919568ac797e7d5a5fd322de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=8+ball+pool+anti+ban+mod+apk PDF link annotation
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/timawawaxikopobox.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/woxexozon.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/63671846265.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/safimololapub.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87ab0f5ff---47761631721.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/ditiladesiwajexaz.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/tefupujibe.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/74731201348.pdfIn PDF document text
    • http://surausa.com/uploads/files/1090957889.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/saxuwapigezawuba.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/suvoj.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/24734310755.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210923091407.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/xuvaledup.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/15579755921.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/sikuduxudimuzerexexu.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109171953094275.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/pugenuv.pdfIn PDF document text
    • https://geloracinta.com/contents/files/74728821095.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/todaxiwa.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/89845234916.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/95997176280.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_off0000ae8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 16612 bytes
SHA-256: d6c17ad368a51d53e9259d90d931ae1b64e7f26865ba2d933f80f37e363e4209
font_02_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 10496 bytes
SHA-256: ed9a17fcbd2886e852486b06bd1d867a5e27bd69a778fbf3288b770bb6f24a39

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