Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8b264778ba3e3b…

MALICIOUS

PDF

76.8 KB Created: 2021-06-09 06:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 41232c4a1daa013ae1f44bab609df6bc SHA-1: 663863bb08b8e29d6f863dc128868c0ae7c270c5 SHA-256: eb8b264778ba3e3bddc0df5fb0bbf5a35baffafc5cc895cc2ee07df992fbb37c
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 pointing to disposable domains, indicating a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/pbw?utm_term=andrew+ang+asset+management+pdf PDF link annotation
    • https://sikefaliwubu.weebly.com/uploads/1/3/4/3/134375420/memagotagime.pdfIn PDF document text
    • https://sarurudadolixo.weebly.com/uploads/1/3/4/6/134644817/2905851fe3bc.pdfIn PDF document text
    • https://sanivuledaxefe.weebly.com/uploads/1/3/4/2/134234591/sejuzuripe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475728/normal_5fe5991b98361.pdfIn PDF document text
    • https://rigopodi.weebly.com/uploads/1/3/4/3/134307943/5dbcec21faa0.pdfIn PDF document text
    • https://puwukozo.weebly.com/uploads/1/3/4/5/134587621/mirarosufowogojeru.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/5216.pdfIn PDF document text
    • https://laxatutokowo.weebly.com/uploads/1/3/5/3/135387201/sixaweviduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_5fda929d12615.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/8ceca1d5cad4b8.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/c51628a7-c495-4ee9-986f-b362c745d301/8760618904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5eb6141-902b-4405-89f9-c2c63c7550da/20473592710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66acabb8-df84-4d4b-8262-c33f3460f2f4/79984669752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852bb2d0-72cd-4c19-8fe1-a508f7730d79/living_with_the_himalayan_masters_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62116f16-d74e-4317-b5b7-f07028cbf115/what_is_the_central_theme_of_the_poem_the_raven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04010f00-73c8-40df-81a7-c89090741d27/libro_el_poder_de_los_padres_que_oran_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0781c6-55b9-47c7-a2ca-58763d1953c7/best_portable_shooting_bench_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7a3fb1-34ae-4c1d-a9dc-01a02d9c8fdc/how_do_you_turn_on_closed_captioning_on_spectrum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2765c7-9b5e-46ba-a3f5-ce0018aaf971/xfinity_tv_dvr_manager.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_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 5408 bytes
SHA-256: 65d29f9670b9ec3fb518be635b47f4037dafdb2156817408b42f57d670bfe0d6
font_01_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 11136 bytes
SHA-256: e266338bbc2978485dfc475261e1a779608854168a2694f5723d1a9a4701258d