Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f440bd5b46cd12f…

MALICIOUS

PDF

76.7 KB Created: 2021-04-05 03:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5e8733fd66977c7d7c0225de378270f1 SHA-1: 8d7f380fb3e305f7aab9ced326a4ae823d03bc75 SHA-256: 9f440bd5b46cd12fccb0c0444c0473bc9668685eb4ac73c069b18cb3b5f48335
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/strik?utm_term=where+can+you+donate+clothes+now PDF link annotation
    • http://kikababono.mywebcommunity.org/xorinufisexuvujiviwiwab.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/578596.pdfIn PDF document text
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/berig.pdfIn PDF document text
    • https://xepolilibud.weebly.com/uploads/1/3/4/5/134591261/napesix.pdfIn PDF document text
    • https://zenovoruzunej.weebly.com/uploads/1/3/4/3/134339910/dujun.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/pulozulalumejezanojipug.pdfIn PDF document text
    • http://xuzunebizojebab.22web.org/venevaliwebobuvejejug.pdfIn PDF document text
    • http://shoppingyxplus.xyz/photoshop_creative_cloud_macgdt0k.pdfIn PDF document text
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/06f97173.pdfIn PDF document text
    • http://cabinetshub.xyz/bitdefender_total_security_setupjqdl8.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/mr_heater_big_maxx_horizontal_vent_kit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kadoxosin.atwebpages.com/calendario_de_vacunas_2020_peru.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_0b99359ba3c640ee98ab157773b20b54.pdf?index=trueIn PDF document text
    • http://dobejul.epizy.com/c_r_p_f_form_online.pdfIn PDF document text
    • http://fawivemepogu.epizy.com/unisa_funza_lushaka_application_form_2018.pdfIn PDF document text
    • http://soxupagab.epizy.com/secondary_amenorrhea.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_7ed1273994444d5191b9145d03d55b47.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_84e766230b1e4ba6abe19a60253d9629.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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 5232 bytes
SHA-256: 27bfc565927962a79bab1dd26f74c6f1d52c954ce9ad391f64d2e8b233493534
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 10816 bytes
SHA-256: 453c8141958e7b376a439a7867ef75ecba4434cea0e004e250bd07f00a044c4b

Open this report in the interactive analyzer, or submit your own file for analysis.