Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b65888e0d486dd…

MALICIOUS

PDF

72.6 KB Created: 2021-01-24 13:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2843be283c0d7f3574be131472afb5bc SHA-1: e66ce2cb2dc12d3fceebc79e55d507ab4fdaeae1 SHA-256: 52b65888e0d486dde9d7046378b76d5ddf2350902745edd4ca4cf19ba687659d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs are likely used to distribute phishing content or further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/aws?utm_term=linear+equations+word+problems+worksheet+answer+key PDF link annotation
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/9060367.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/pabetubujulubijewize.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5fc6dce64534f.pdfIn PDF document text
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/xesoxamojokijof-bikupol-zikaruxebota-vikupumasoteme.pdfIn PDF document text
    • http://penoligis.22web.org/executive_summary_apa_template.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/4345859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451757/normal_600102d2bdd2e.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/attendance_sheet_in_spanish.pdfIn PDF document text
    • https://rejasujewefem.weebly.com/uploads/1/3/0/7/130738882/musijijememawer_xizogodipa_sifowimixode_newanubever.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
    • https://s3.amazonaws.com/jotizifime/lazoxodidigeba.pdfIn PDF document text
    • http://nevigewiba.epizy.com/baal_veer_434_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/mamopalokatanoxoju.pdfIn PDF document text
    • http://tinipukax.epizy.com/todimaru.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_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 5548 bytes
SHA-256: e586d4a754e5b176ea27702bc810f5973936c217d533b947c344abf3d5623d68
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 10776 bytes
SHA-256: ed746363bd90524659d0c8ad28efa6a537c7557807ec0da5609e532b961c1925
font_02_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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