Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb5970da188ce6a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 02:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9b36ebb6404aedd31ada070803318ec SHA-1: 6d9f3fe2d081e4175127d8f165cae7dfab831208 SHA-256: efb5970da188ce6aa7e581f9258f58d343940cf6356a24d16003c5998c69edeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malicious download lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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 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://cructi.ru/uplcv?utm_term=download+ppsspp+naruto PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa792860f---30070593449.pdfIn PDF document text
    • https://salwangurugram.com/files/rizukasinijeb.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905031309.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13586326775.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210912_082405.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/detemaxidetekekam.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/ragokazapusunupixaper.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/tukewivesunewupedorigawo.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210909022654.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/jesolitabivifubisumizatu.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/18967910471.pdfIn PDF document text
    • http://mgrima.com/files/file/57699526590.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/25288402035.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/sumipakifipuxipeb.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/limikinefetutum.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/52694074487.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210916165636.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614483b2ba6d1---65178507250.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/mumubito.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/figebazibad.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/jetob.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021961131343081.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_off0000b636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB636 10348 bytes
SHA-256: 0b7e4db8345c579891d2a84fbd0f2f3d4d199dc98afec976e4f0d32086f4cc84
font_01_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 16680 bytes
SHA-256: fd023d3665e3df4829f16d82cfde2bb4e4bff4add72ee92c73413de035d3f876
font_02_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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