Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d86a8511fe3cc67…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 10:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 767f8358d596770b0ee9582e83f0b354 SHA-1: 86eea2047b068e4c10c135b1d24a4bd1ba84d895 SHA-256: 4d86a8511fe3cc67500225220bdbabb1d981e5a26ef31af452161dc8c5ca9053
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=summoner+war+lost+centuria+apk PDF link annotation
    • https://associazionebriciole.it/public/file/modelokorofuka.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jixeb.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/93820959985.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/97712938294.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/wizosuzejativevizokilo.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/mezijedepagojorakewobaxob.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/26914768288.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/watunamazowefotakowemija.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/pobelifuxo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/53480744246.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/nafesutezerezewetumasose.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/34034059753.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/42297046912.pdfIn PDF document text
    • http://dsraxys.com/uploads/94969030064.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/22283406056.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/25217205016.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/parufipifaviwe.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/91392805445.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/27403204492.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/46230144619.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/76850730525.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sexinuruputix.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

Related samples 5

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_off0000b2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 19208 bytes
SHA-256: 5acd571d74b1704b503f48db751408a6b5d2ecabdf6b7014797501647a5ec73c
font_01_sfnt_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 10888 bytes
SHA-256: 3923d1ce25aa91cdb869eeae50f7f4197d69ee7e0b59b68d7d74765124c9be22
font_02_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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