Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8a0ac2e2b8042d…

MALICIOUS

PDF

74.6 KB Created: 2021-06-12 21:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 02327f33ad421f5d52a86e2601443b01 SHA-1: 6c97d940b97a0d323ee3960bcb047bc6f0c57a02 SHA-256: 4e8a0ac2e2b8042d536eab3c3dccced3f11fc4672cbbef768566ebde33ee1e25
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'Laravel step by step tutorial pdf', aiming to trick users into clicking the embedded malicious links.

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
  • 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://inwebjor.ru/pbw?utm_term=laravel+step+by+step+tutorial+pdf PDF link annotation
    • https://telumenodizoxop.weebly.com/uploads/1/3/4/2/134266327/2396613.pdfIn PDF document text
    • https://lupobola.weebly.com/uploads/1/3/3/9/133999804/74c61314cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601dd1289c0bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_6048ffbc2fb9e.pdfIn PDF document text
    • https://babibuxa.weebly.com/uploads/1/3/5/3/135302477/lasavazokatugo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421612/normal_5feda53e3c8fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_602ea8fdf3bad.pdfIn PDF document text
    • https://kobijetiva.weebly.com/uploads/1/3/4/3/134322382/3765256.pdfIn PDF document text
    • https://sabazufolitok.weebly.com/uploads/1/3/4/5/134585121/dc74d9f807e0cf.pdfIn PDF document text
    • https://vowuzuvave.weebly.com/uploads/1/3/4/8/134884034/9188967.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/f1979a8b-8875-4df2-83c3-c4aa521935a3/xozujikonikebejexamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee6bac6-164f-4e13-b81a-6574380a5822/listening_assessment_rubric.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144712434/rukumofakubajipazizozuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1580e4b5-fe75-475b-9087-f3403053db5b/towenerepimogalerebavete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140a325e-2cdd-4f6f-bad2-c83713e019d9/functional_training_equipment_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62cfad65-e40c-4e0b-ba32-4d3b902fc400/scream_4_voice_changer_app_download.pdfIn PDF document text
    • http://tujedet.pbworks.com/w/file/fetch/144628098/72552938740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484b494b-a09a-4536-b76e-0b2decdbbd3e/encyclopedia_brown_what_age.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144539124/67866212982.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144642318/free_download_video_background_changer_software.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/f/lamojomawawiwebos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40832e7f-ccc8-4521-ab66-4be9b16b5f6d/46471176672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f0f7e6-0ad7-460d-bb30-e1505dd96d0b/89967514991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9717674e-ee98-4d3c-95d1-57c2e06c4f61/how_to_connect_verizon_remote_to_cable_box.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_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 5280 bytes
SHA-256: 8da0a92cb37be24fbd07fe29fe0e9b9a7464c92fe64c4b04d584845dc91f0d78
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 11444 bytes
SHA-256: 9f32925cf4116bf4a109173cec93f94b19d480b182e24510b163222aea244a36