Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee34d9da98bc2bae…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 08:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 728f5f61dbd7e3261df55a06348067b9 SHA-1: 57834f6fabab77841b6584ae25bb1fc083dce84b SHA-256: ee34d9da98bc2baea9f25edc1be48e7b5779cf693a3ad3e663fd7239f4459e2e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or ad fraud. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://soxebez.ru/strik?utm_term=what+is+the+difference+between+bowflex+pr1000+and+pr3000 PDF link annotation
    • http://fumigatoff.online/small_engine_repair_course_nlhf3h7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5fe6b970906e0.pdfIn PDF document text
    • http://teenagetutor.online/what_weight_is_red_heart_super_saver_chunky_yarntvqe5.pdfIn PDF document text
    • http://hot-money.fun/list_of_air_borne_diseasesf6v37.pdfIn PDF document text
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/5cc29a21.pdfIn PDF document text
    • https://bamewubi.weebly.com/uploads/1/3/2/3/132303354/nevokofavusixagex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5fe53f754c5ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_6343ed0989a14d24930b69dc15436085.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7e39f3-c02a-4bf0-a289-6dbc47d659e1/what_is_the_history_behind_sweet_potatoes_leaves.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_4af34fca559b4a20a012093c15d4fe5c.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_a50bcd6c280e4087b5b26da97fc9ddba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6866d3d5-0e15-48be-8cbe-b2384b5f4568/list_10_elements_of_system_approach_to_instruction.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_a3ba5e1d0fee43998b2940ec0f3b5779.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_9324803e47ae41e5a09a26613fb5cd07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41028d0-8da8-4ca0-af43-42f69bc69bbe/jesus_storybook_bible_christmas_story.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_89d8fe50a6db41619dc15c32ba38efcf.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_1c6c66e6567f4a8485fa2f8297d270de.pdf?index=trueIn 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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 5912 bytes
SHA-256: bad560ddd115b5363890ba6842c26015bcaf9fc9be3eeb419433f92abf50e951
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 10888 bytes
SHA-256: 6f4cf28b4ecd0d3ba7f27e3f2df962fb3f97ee42ac5bc51cc87cd25ffeb42d12