Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ec8e54469a74c6…

MALICIOUS

PDF

74.8 KB Created: 2021-04-06 20:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: adb5180f885278a00b3fa066f8686250 SHA-1: 5318066fbcf717a7a784091a1322ed59f0be1098 SHA-256: 41ec8e54469a74c6c96464bb0bc320b3bf500f0570a6373ffb3f32ba79c8bcc4
186 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains and Weebly/Strikingly hosted PDFs, indicating a link farm or SEO manipulation tactic. The presence of multiple external URIs and the overall structure suggest it's intended to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=innovage+products+jumbo+universal+remote+codes PDF link annotation
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/fakemirivaleza.pdfIn PDF document text
    • http://chambreapp.xyz/what_is_general_public_international_lawj8qty.pdfIn PDF document text
    • http://moneyindia.site/bugepovemufunodadopizubtalbj.pdfIn PDF document text
    • https://jotafatebukuzeb.weebly.com/uploads/1/3/0/7/130776674/vakuzedaje-lebigu-relola.pdfIn PDF document text
    • http://afracheat8.xyz/brewers_schedule_2020yl5hg.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/ahcjcif/hitmasters_app_store.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/f50dde7cc5.pdfIn PDF document text
    • http://50offshop.info/raboket9ai.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jhbifgj/music_video_maker_app_download_kaise_kare.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/63c853ee-553c-42a9-88da-2ce09d90a685/1886905968.pdfIn PDF document text
    • https://71fc3d66-43b2-4ae0-adc3-dfbcdf8b5360.filesusr.com/ugd/6605a0_4ed693ab707d4a68af733171dd7ab650.pdf?index=trueIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_43281c88b0dc4ce8a3bab175e2275230.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_ccb878a504264f93a626612c302ff0b7.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_7af73e99a31142979e15ba22572c7133.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9f9fba-17f7-429a-bc81-dbe45c7118ac/tunewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3c3dd3-3388-4d95-a1d0-90e1b427ffb4/why_is_my_toshiba_flat_screen_tv_blinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c20454-3ed1-46fd-990d-35836053e059/list_of_subordinating_conjunctions.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_f748a00ab8a046b3aa0b29298ce27cdf.pdf?index=trueIn PDF document text
    • https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_f33ae7972a5f4d36ae15d362deda716b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15d75c3-5b89-40d5-a4a8-c41466e5ef65/el_nombre_de_la_rosa_serie_capitulo_1_online.pdfIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_2037eec80b5f43d9942d001c179f645d.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_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 5608 bytes
SHA-256: 9e868a55ed8aa71262f539708529cd1d5528f18ece5e46afea7b85f5c9036caa
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 10436 bytes
SHA-256: 5f98f1d9db8d8cc1ad3c4a709fc18ae0e4979a8d6d10cbcf5462779f73f86e72