Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b66ae10239314a8…

MALICIOUS

PDF

81.2 KB Created: 2021-04-03 09:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 573575b1ec6a9987623e1e9187255911 SHA-1: 7d4bb61fe2e9247a650ebbb38df7d7477b1a840a SHA-256: 3b66ae10239314a822c5eb3eebaea1a0c205409be540a9e43349bb7ab00b36c7
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'intermediate accounting study guide pdf', indicating a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/wix?keyword=intermediate+accounting+study+guide+pdf PDF link annotation
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/4a8990.pdfIn PDF document text
    • http://niveranat.iblogger.org/2688409829.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/hbgeTgf/55483200384.pdfIn PDF document text
    • http://wufujapebapu.22web.org/pufolixelukimotexib.pdfIn PDF document text
    • https://vixezijimike.weebly.com/uploads/1/3/5/9/135993975/xaxodunut.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/miwubesad.pdfIn PDF document text
    • https://cdn.sqhk.co/julubesaf/gi6ihie/23897697061.pdfIn PDF document text
    • http://sozisogu.iblogger.org/watiraradejow.pdfIn PDF document text
    • https://pogiwaxo.weebly.com/uploads/1/3/5/3/135312355/wogijetisakuxoro.pdfIn PDF document text
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/fekoborod_nuwadupug_bagomoguxida_refuxo.pdfIn PDF document text
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/gepiwakot-kujesaroninex-majawutiwefol.pdfIn PDF document text
    • http://kikaxefe.22web.org/36334681669.pdfIn PDF document text
    • https://tagunodakaveb.weebly.com/uploads/1/3/4/8/134865504/062ae0221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nofoforom.epizy.com/47445758273.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/66260524404.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/26935886425.pdfIn PDF document text
    • http://mawebiruna.rf.gd/calibration_of_pressure_gauge_experiment.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/81991721778.pdfIn PDF document text
    • http://jedadezutovokiz.epizy.com/1239794962.pdfIn PDF document text
    • http://fanurumuge.epizy.com/human_anatomy_atlas_2019_apk_mod.pdfIn PDF document text
    • http://bumupumelagel.epizy.com/wuxexebebanurudisewipi.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/25044390368.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/21826426274.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 5484 bytes
SHA-256: 9984ae61710f9121063107d6abd39846316c34239e026265be1d35f1f4634ecf
font_01_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 10712 bytes
SHA-256: 59fd274a29ca6bcc5c942ba2a258169ae387e9f45911261400726c55b63c7423

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