Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76ee8b1057aaa8d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 04:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0fa0f80328cf7e80bab663686ffcfb5 SHA-1: 2abec5f335c31545adbe49837418ef17402e83ef SHA-256: b76ee8b1057aaa8da01a649c24536cb86c4730fbf552cb70a97c33ae5b25ef3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to host numerous links on potentially compromised or low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://catamma.ru/uplcv?utm_term=physical+properties+of+carboxylic+acid PDF link annotation
    • http://bisenzia.it/userfiles/files/62613630364.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/nozefovan.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/35798734434.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/disut.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/3014390898.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/53803183017.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/82753766715.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/26923619347.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/wezififerozuwamaf.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/tojomejene.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/23982118769.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/tefukesisutipidaworutaz.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1f7a04156dac65b8fe1cf868ecaf36f6/71738341761.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/31580371481.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/1968916919.pdfIn PDF document text
    • http://lejuriste.ru/files/file/gufutexilemisefenel.pdfIn PDF document text
    • http://thevalleytrader.com/files/dinelupumofogesa.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/93341710023.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/duvisinokobip.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/nizivorifusesoxefuzin.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109201200483484.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/63025403917.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/zevosipepininidagipig.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE91 16584 bytes
SHA-256: aaaeb1d780ab0a77754f56efd9d941b05712161488b9f785ee2e0caa8ead5ca0
font_01_sfnt_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 10968 bytes
SHA-256: 653d76224aca25f5d457a74a22d0b0cc2bf9dd635715fc3d30c49e2e95da3925
font_02_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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