Malicious PDF — malware analysis report

Static analysis result for SHA-256 73459578a728c3cb…

MALICIOUS

PDF

84.8 KB Created: 2021-04-30 19:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2a8ec0d570fb2d33325ccd546f94711c SHA-1: 4a3bfa0997ce83cc0359fb0592378e8d4cb9cfeb SHA-256: 73459578a728c3cba54f0319433119407f98243668ee5c37a847968253381b01
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV both flagged the file as malicious, with ClamAV specifically identifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=eight+limbs+of+yoga+pdf PDF link annotation
    • http://firstdoctor.xyz/casio_protrek_smart_watch_wsd-f30733r4.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/3484187.pdfIn PDF document text
    • http://gamedv.design/plan_de_negocios_de_un_restaurante_ejemploik0zf.pdfIn PDF document text
    • https://letobepep.weebly.com/uploads/1/3/0/7/130740206/gibefogupare.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/170362.pdfIn PDF document text
    • http://distornyup.site/divine_intervention_in_the_odyssey_quoteskwg6h.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/5018092.pdfIn PDF document text
    • http://uscarinsurance.info/kangertech_evod_vv_how_to_use2hlye.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_60580b4c22a14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427780/normal_5fdf66c86c48e.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/zovuneko7ab7e.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/sekafikubosowo.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/bde5d448-b9b3-455f-ae15-5310620f9e3b/stephen_king_on_writing_chapter_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e2906b-d6e0-4bc3-9b33-8c64b3784aba/kizotisuwilujagepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6428f2-8d3c-4c96-bbc8-eddeda7e27fe/tavesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0599988-f6c1-4c1e-b884-b4a9b3daa99e/questions_about_aristotle_nicomachean_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97d3870-b5a3-4b75-a08b-3d3dd73690f9/28449219931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2cc445f-13f6-4573-906c-722da454f9a3/midizidodubirizon.pdfIn PDF document text
    • http://muwalolerede.epizy.com/felesazig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37214db-4a1e-435d-ad7a-5d59ca8e4c24/97973787867.pdfIn PDF document text
    • http://xemixelumulimos.epizy.com/how_to_make_custom_air_force_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e92b6f5-eabf-4a9d-9e0e-2bd0d5dddc34/pentax_k3_manual_lens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601eda33-2041-4c7d-87d2-e59b4cacc63f/craftsman_19.2_volt_c3_replacement_battery_pack.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_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 1728 bytes
SHA-256: f9362516247f5457f35ce7f6506ef6628a08333b33ee28e066d4346544226895
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 5556 bytes
SHA-256: 52b2e3c01fdb1a1df5efc14bd648dd45250bcae68b16c14db0faa6318381845f
font_02_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 11492 bytes
SHA-256: 64dfba843c957d4d90956c396594f742d318e60de33c26af31038c52a8a5ee61