Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec44521b13f8e561…

MALICIOUS

PDF

75.5 KB Created: 2021-06-03 21:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 59f0813569d632e363879784a5f6de0e SHA-1: abf0cf597e60e8d92906b127b3b550b1db220007 SHA-256: ec44521b13f8e5611fb5c95d11c29b372788f6dd95e8141660c9875010cc4785
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 0.9991

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://krisoc.ru/pbw?utm_term=dream+league+soccer+2015+apk+dinheiro+infinito PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5fe2cb8298603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_601c75be3c1e4.pdfIn PDF document text
    • https://bigamurutixigi.weebly.com/uploads/1/3/4/4/134481126/475519.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/0fcfb711510b7ce.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/954387.pdfIn PDF document text
    • https://tedaliduvif.weebly.com/uploads/1/3/5/9/135957254/b76d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_6029809ee7c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_601a996aafdca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427104/normal_5ffbddcb85536.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/jilejegepa.pdfIn PDF document text
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/xazupefagosew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_60446249d3a1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_6064fdf149e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fea1dbebefdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_6039b3dd632e5.pdfIn PDF document text
    • https://zigulowowe.weebly.com/uploads/1/3/1/3/131380415/2539974.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478393/normal_5fe1962ebc61d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gibuwodebu.pbworks.com/f/watotiledemidobekavojimow.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/tere_bina_jeena_saza_ho_gaya_sanu_dj_song_mp3.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144485607/97892154960.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144458382/comic_the_walking_dead_7_espaol.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/w/file/fetch/144458301/ejercicios_resueltos_de_preparacion_y_evaluacion_de_proyectos.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144538950/89256806192.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/f/8542384025.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/xekojopura.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_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 6084 bytes
SHA-256: 75c1b42add6a1869170342f6ac50390644b5ec1943a2af0180bd32981d3dd819
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 13492 bytes
SHA-256: b8a2de0a569527d18fa8a7141a3bc59e4a11d4ac29c1d1352d9debc89c52fcbe