Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a57ed203278e37…

MALICIOUS

PDF

73.2 KB Created: 2021-03-11 23:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 3b290a360f01b446e48b1756305abc95 SHA-1: ae869198704bd5f08c8f7a933a4268319ffe1fc9 SHA-256: b9a57ed203278e371dcb167b9afaa50a4e5157224d3608fdd73aeaab69e8477d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. A key heuristic identified a 'Browser extension / update installation lure,' suggesting the document's primary goal is to deceive users into installing malicious software. Several external URLs were extracted, likely serving as download locations for the secondary payload or for phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dugedepap.ru/award?keyword=breviario+latin+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fd087cb991b4.pdfIn PDF document text
    • http://detonic-ufficiale.website/91908197952u27d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5fc621ce2e66c.pdfIn PDF document text
    • http://shop-kid-toys.online/200063206slggc.pdfIn PDF document text
    • http://sunshop.pro/email_formal_en_ingles_despedidaac7zq.pdfIn PDF document text
    • http://womenalikumat.22web.org/coreldraw_2019_full_crack_kuyhaa.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/5449029429lug63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fe38f84e38c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601dde7fbc9bd.pdfIn PDF document text
    • http://grandov.pro/dnd_5e_werewolf_lycanthropycge48.pdfIn PDF document text
    • http://soldatskaya6.ru/science_form_2_kssm_chapter_86f7bp.pdfIn PDF document text
    • http://philonio.online/62951097510o9cbf.pdfIn PDF document text
    • http://mobile-media.moscow/migibi6igd1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupozefi.epizy.com/tidifefe.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_a781bb41c61b43e78e96e87f958f7f97.pdf?index=trueIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_74580c3f4bad4165a5d16c6076e6fff0.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_b738cb29b9a3416296f374cb640c9cb9.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_ecb44d917047480fb94df297fd2c9d8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e856ae05-767d-4d92-ab1e-ed3cbfe3b6ae/what_is_the_best_orientation_for_a_house_in_ireland.pdfIn PDF document text
    • http://moretavumafoge.epizy.com/47805427302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b178489-73d9-47f1-a048-89999122d093/ronco_showtime_rotisserie_5000_parts.pdfIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_746b588da7664b7682f72bece961cbd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7baccb35-f3d5-463a-938a-be9ee2d4139a/mudatigazexovoxiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e711b5c7-45b4-42b3-a036-5799f75f452c/relulidejememakotekalat.pdfIn PDF document text
    • http://jadokekuw.rf.gd/fixojewoseririxezel.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 4964 bytes
SHA-256: bc39648efda85da3c4265bee1255253c77c6e036392dd0fe301fe70dc81b44a4
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 10336 bytes
SHA-256: 6c190fa015c793d669a9ca5e8fca0890de36595e32ce0ee1f584251b73f8027a