Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae805dff5941cb00…

MALICIOUS

PDF

82.0 KB Created: 2021-03-12 17:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d40aed967b79772d75f06bf56699bdc3 SHA-1: 20210901612119cd62a98f2ddeec229fff6ec5b6 SHA-256: ae805dff5941cb000473fca9f2e58d417596866a94a148e412e5b3092b9a4664
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'xezojetit.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=polygons+exterior+and+interior+angles+worksheets PDF link annotation
    • https://cdn.sqhk.co/govonesed/gjehhvH/636551619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5fe500fdbd69d.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/5hakghf/xisuvazateliwale.pdfIn PDF document text
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/dibaki-gekufinapiva-fexafonatub-mizusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fdbdd6fbbc69.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/bunopokuvib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5fe90334e3c7b.pdfIn PDF document text
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/2f517b889.pdfIn PDF document text
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/gimerijotomi.pdfIn PDF document text
    • http://widarexidifazi.iblogger.org/cymera_for_android_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446286/normal_6006b2a47b266.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/sJjggiN/dazezovunomupaxixupumejur.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
    • https://uploads.strikinglycdn.com/files/1055912a-7192-408a-bb63-22f96721518d/gozarejugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ba87f4-b6ab-4abf-95e7-b286f78329f6/what_is_image_file_operating_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c26947-ef2f-4d9c-918a-1b1efe25a03d/34637203999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5b1c88-bc6c-4ec3-a2c5-1d10e840e938/pulgadas_a_milimetros_en_fontaneria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32e601d-db51-4aaa-af30-6c206f080198/weight_watchers_scale_manual_ww37gd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0ae477-f10e-4e1e-b3ba-0c4cede872d0/tujekoruwosasagujono.pdfIn PDF document text
    • http://satonavuka.rf.gd/what_is_the_rule_for_subtracting_fractions_with_unlike_denominators.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef9e214d-c29f-4f86-ba68-fefafdc200a3/how_to_draw_a_heart_with_pencil.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_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 5200 bytes
SHA-256: fc5182bf7c67474acb97ebe87828b128f7405d59047f77a373f754ceb0c05b90
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 11292 bytes
SHA-256: 69f6c8e40bf2c1795557b4cc194700a9f139ae41e70e64c0a75469fe281b5aed
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e