Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb0a16a6c786017…

MALICIOUS

PDF

79.1 KB Created: 2021-02-27 05:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 08aea5f704e5c3708b08ab27d4bc74a2 SHA-1: 28c3e5cb862aabaec1dd8399396e8ea36e75b446 SHA-256: bcb0a16a6c7860175b00affedf91817864b1c09150a3607812cc1ec8de9a0501
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 distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a common technique of using documents as a lure to download further payloads.

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://resalured.ru/strik?utm_term=free+elementary+map+skills+worksheets PDF link annotation
    • http://slimerecipe.org/auto_chess_apk_mod9snar.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/digNwzz/sifefafij.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/cijhnpf/vaxiniwunafar.pdfIn PDF document text
    • http://stikc.xyz/8372825276565772.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/kimugijepurir.pdfIn PDF document text
    • http://sun-italy.space/pentair_superflo_pool_pump_leaking2xnii.pdfIn PDF document text
    • https://cdn.sqhk.co/tovozovuzedu/bghgcHs/pukesagaxivizate.pdfIn PDF document text
    • https://cdn.sqhk.co/wotedimozer/STgMpgf/metukux.pdfIn PDF document text
    • http://winoorama.space/tamilrockers_hd_hollywood_movies_2018_freelzchr.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/jezasas.pdfIn PDF document text
    • http://thechambre.xyz/lubarodagaronimermy25.pdfIn PDF document text
    • https://cdn.sqhk.co/tinajugezepi/jdr0Bgi/rummikub_online_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/xjjFifV/guradogupoxigelosa.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/64594109335.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/kapelafimif.pdfIn PDF document text
    • http://vekvelo.ru/bl2_haderax_the_invincible_guide4u25v.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/4607840.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/23345592995.pdfIn PDF document text
    • http://vertigoa.online/wonoterefa2ds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lobopekogolo.onlinewebshop.net/74429756908.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 5060 bytes
SHA-256: 276ae65fd2381e2ad963d44e6188243628650de680c2b881726efefd74652c68
font_01_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 11260 bytes
SHA-256: 3887de18049ba01fba12f4ef54fb145f92d2662d4a4058ade2f84c1b78170fed
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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