Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a754f267b83962d…

MALICIOUS

PDF

80.3 KB Created: 2021-06-01 00:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 15166c4ab93fe61f4a17b789321161f3 SHA-1: 8bf1ba43e15cfe4630be2ace46240acc66df2970 SHA-256: 3a754f267b83962dfbf64f3506e71cd729c2f702b665ef3caf460d83d24a5fa3
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/pbw?utm_term=the+complete+book+of+woodworking+by+tom+carpenter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5ff942ddf3a5a.pdfIn PDF document text
    • https://maminimavuzi.weebly.com/uploads/1/3/4/6/134640728/db43b73d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_603aacd5e5322.pdfIn PDF document text
    • https://torimavilok.weebly.com/uploads/1/3/5/9/135984964/580de.pdfIn PDF document text
    • https://piwuwati.weebly.com/uploads/1/3/4/4/134404243/0e9d8ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_602dfeb672f6b.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/3727563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5ffb133b7a942.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/majirulanudupiv-wiwowe-nofusodabapidad-siwijamege.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/919f2d9648ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_603604b2a7ecc.pdfIn PDF document text
    • https://jokimaxe.weebly.com/uploads/1/3/7/5/137513409/4370540.pdfIn PDF document text
    • https://wositilukawagit.weebly.com/uploads/1/3/4/8/134848776/gutonagi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144413997/can_you_cook_stuffed_chicken_breast_on_the_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2284b9c4-fa9d-4942-a301-63e43e987580/knex_big_ball_factory_63045_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9f116e-2ada-4ec9-bf29-830abaac6c5b/what_are_the_4_stages_of_development_in_the_uae.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144428682/how_to_end_my_conclusion_paragraph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11897531-11ac-43e5-9df0-284e87578a74/zane_book_list_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296a400e-b2c0-4224-b8ea-515320d9ce10/jojikikilerivovoju.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144414363/samuberu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93faf36-7866-467f-a72b-95d9fe3b3819/9742171042.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/lista_de_exercicios_multiplicao_e_diviso_com_numeros_inteiros.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/seginadodimagokigame.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5528 bytes
SHA-256: ef6e359d219fdb9adca3540b418c6be3b68a9051de808a5cef2e7be81d7391e3
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 10840 bytes
SHA-256: 632ac2cd53619fd1f0199d9ea3ce2d1b186a7e347a27aec4d34cec102e3531db
font_02_sfnt_off000124f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3