Malicious PDF — malware analysis report

Static analysis result for SHA-256 726cb72c29037631…

MALICIOUS

PDF

76.4 KB Created: 2021-04-28 16:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 54760840c9c10bba2c47e3ee6ea5aae3 SHA-1: e3febbddb85c150bff1db13f1cc4e63b3319c3d7 SHA-256: 726cb72c290376314d362fadd0d7a45deb3b3aa3fbf18830663781c228b80fd9
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 hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=john+deere+l130+belt+diagram PDF link annotation
    • https://cdn.sqhk.co/kekelivig/gr477ik/marching_band_store.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/hd7ggy4/fozedi.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/jcG0CsO/tekeposadexefir.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/WiiFjOt/cloud_browser_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/5gfxha2/71895148380.pdfIn PDF document text
    • https://cdn.sqhk.co/vofosutuwo/v6higgD/roxajavipedisapilipamap.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/mieU8jd/nbc_sports_live_stream_free_nascar.pdfIn PDF document text
    • http://kidalozexeneni.iblogger.org/body_code_healing_system.pdfIn PDF document text
    • https://cdn.sqhk.co/xadopazo/ja7rhi6/92345762985.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/fEkrWib/xunagutobajuguxoze.pdfIn PDF document text
    • https://cdn.sqhk.co/zoraxiraga/p8DudL5/wazogerivopawe.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorabuzep/U3xljgQ/jupevazefugusogotosal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64db0a9d-d2b7-4705-beb9-75cca7f1d068.filesusr.com/ugd/4c6241_3ac0c4abca8f48f492a8212baae544d6.pdf?index=trueIn PDF document text
    • http://tegikemi.rf.gd/bomunuxur.pdfIn PDF document text
    • http://nubopasorafat.rf.gd/2147202852.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_6f4cf0da2d08425a98cf92ef1c5f5c6e.pdf?index=trueIn PDF document text
    • http://gozidonozali.myartsonline.com/hydraulic_sheet_bending_machine.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_6bb81f4812c048a7b48af748436aee5e.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_a4a4ecdcbe7f4bb981f54ad5cba2240b.pdf?index=trueIn PDF document text
    • http://xalilitu.epizy.com/bittencourt_penal_2.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/bridgman_the_human_machine.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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 5548 bytes
SHA-256: fd8e763283f179e9778ccaea6f2b9a962a7ff246071c45b8b0a0dc6f8e036804
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 11092 bytes
SHA-256: 3542ec71a6dccb8383eda5cd37861d6302c58e2b2a08338632474a89b064e67e