Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a62b39bc356aa2…

MALICIOUS

PDF

74.5 KB Created: 2021-03-08 22:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65f781339c4d0ee88182fdc04cdc3e01 SHA-1: b5067337ba96787b0c0cedd6146c1438fcf61960 SHA-256: b7a62b39bc356aa2c062ba1a1e7aa9016bc728d9621e194da992a8d08333e0bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with the primary one leading to a domain associated with phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or malware distribution. ClamAV also detected this as 'Pdf.Phishing.Trojan'. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=apostila+concurso+administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+pdf
    • http://mirijesuwakug.sportsontheweb.net/schwinn_deluxe_bicycle_mounted_child_carrier_install.pdf
    • http://luwogexejel.getenjoyment.net/how_to_read_pmbok_6th_edition.pdf
    • http://jidapuxedepu.medianewsonline.com/2987733479.pdf
    • http://nakotigolajeg.scienceontheweb.net/73777522429.pdf
    • http://lunagogafoxoj.sportsontheweb.net/kenokazopoloxututise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67ccaa3e-177b-48a5-9944-9d9cc7d7fc20/iit_foundation_books_for_class_10_mathematics.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_26546e90c6494ab5a45a626d9643f67e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/850084f3-b15b-4edd-9a2d-b629c8296cc1/52666519161.pdf
    • http://liroporuki.myartsonline.com/wireless_n_repeater_wps_connect.pdf
    • https://uploads.strikinglycdn.com/files/f5c866c5-878d-4b27-843e-bbebee1edd3b/xitemoferukap.pdf
    • https://uploads.strikinglycdn.com/files/dbc66d46-0dd1-44da-a4f8-b8fc1f1c45a5/nespresso_vertuoline_compatible_pods.pdf
    • https://uploads.strikinglycdn.com/files/7e340485-a1d5-420f-afd7-8ddc571ee807/68254599155.pdf
    • https://uploads.strikinglycdn.com/files/ee680aed-85ab-4c11-8aaa-07921c5bec1d/prisoner_b-3087_google_drive.pdf
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_465f48b88ced4ae3ba0d578623b969b4.pdf?index=true
    • http://xijewixevav.onlinewebshop.net/xixumipi.pdf
    • https://uploads.strikinglycdn.com/files/a2662add-7e05-46ad-b8ff-c22c6d6299d6/4283065114.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcec.bin
1c562b625816ffd992b561dbf1e331971a166dc477a98c58df61326d773c8bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 6044 bytes
font_01_sfnt_off0000f054.bin
cb8e776442acbd304778bbc6e93663c8bc42dbe35f5ba2403b93f706b0b81654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 14384 bytes

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