Malicious PDF — malware analysis report

Static analysis result for SHA-256 05db77873756fd67…

MALICIOUS

PDF

105.4 KB Created: 2021-05-30 09:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7eaa632288f9cf2e2f70aa81de0fac14 SHA-1: 1bf8699109a01d4d6654fcaf282f8784c8faf0d4 SHA-256: 05db77873756fd6797d7e22effb01e418a2d2978ea6dff1d21ea78ba80c11c73
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is part of a link farm designed to redirect users, likely for phishing or malware distribution. While no scripts were directly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=dominion+tower+guide+rs3 In PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4490523/normal_60b30a798426f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5fcc0c0fdb038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489839/normal_6000bc7eeea95.pdfIn PDF document text
    • https://gonadasefu.weebly.com/uploads/1/3/5/3/135345348/3688780.pdfIn PDF document text
    • https://pekosorevonoxa.weebly.com/uploads/1/3/0/7/130739373/2362536ef11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_604aa004521ce.pdfIn PDF document text
    • https://rifuvosibimav.weebly.com/uploads/1/3/5/3/135383082/f02574c1.pdfIn PDF document text
    • https://ziravejutit.weebly.com/uploads/1/3/0/7/130740001/7089267.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4492901/normal_60afe2df54b2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26eb899f-3f81-42e2-b525-6fbdea5ec1bd/22572648483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d874775-fd45-4977-8da1-9e41319044eb/star_citizen_download_stuck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a75afa4-9be9-47ce-ac4e-6303de8391ff/download_game_ultraman_orb_mod_apk_versi_terbaru_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27dd3930-7f3f-41c1-9fd6-19da1bb6422a/mumobegaloporatupewarom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fe70f4-4115-4046-a87b-40b0030f2c5a/como_descargar_la_biblia_latinoamericana_en_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0ea510-b247-4e07-81a0-16cf4b2edecf/scag_freedom_z_61_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcc500f-d251-46ee-94a1-8cd33b1f76b6/79203402834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198ad3e7-218b-41e5-b04a-e025d9ba42db/80060106514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2be0ff-1671-463e-b2c7-7e86c16c94a5/pogunobipeluxoworugomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c817e08-691a-4c1d-8929-9daf58b8e988/common_core_math_sheets_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e1d3c7-db08-400f-b5a9-f808d93ab5d1/konica_minolta_bizhub_c224e_tonery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9f0072-640d-4a61-b3af-bdce4629354e/what_are_some_possible_errors_in_an_experiment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f970b17-7e88-426d-9181-25f233e82ff5/cuantos_dientes_tiene_un_nio_de_1_ao.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_off00016037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16037 5156 bytes
SHA-256: 9dbe1fce2d89617906cc58bff38ecb9a83e2ec87ad21ca9364a0c10a07f2dfac
font_01_sfnt_off000171c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C7 11252 bytes
SHA-256: 28b01d169a61539cff587b04cca124537599fe735027532ec2ad6a9f3c034095