Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4ed0ff65428116…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 12:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0caf181b3a87041eaa015e4fe76a05c6 SHA-1: 900ebb889eac964801b4bd9695ef6ce86b268001 SHA-256: 3c4ed0ff65428116220486b83adb4a66352dca0f716461c83e47ff56e22114d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous distinct hosts, many of which are likely disposable. This behavior is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://schokoladenfontaene.de/idata/rezanogekufufonoxa.pdf In PDF document text
    • http://faizleathergloves.com/userfiles/files/93403881385.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/88295125506.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/kubusidimasaputedofev.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210925111618617.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/9403083968.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614018bf7e969---6158776541.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/58097347178.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/24695050815.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/55577295187.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/jezukefid.pdfIn PDF document text
    • http://labonscafe.com/userfiles/jezilafevulelulilida.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/12243175548.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/dakozaxudopuwavi.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/wajasosi.pdfIn PDF document text
    • http://artospace.com/pics/file/89312195522.pdfIn PDF document text
    • http://portableandcool.com/files/files/84179108340.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/92224406338.pdfIn PDF document text
    • https://eclearusa.com/images/file/winemowuwegi.pdfIn PDF document text
    • https://onecre.com/images/content/files/ropuwegozebazivekazawuril.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210911/file/polisatole.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/18746330002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=small+house+two+bedroom+designPDF link annotation
    • 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_off0000acd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 16384 bytes
SHA-256: c6086164e5eae3728fb89755426ca636e1f361c9b405d0878599387be6b01df5
font_02_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 11096 bytes
SHA-256: c6b9b2e30ab9394f06c3bc33f718673ae0cffc2b3a6ad6206cef5068c0b8e600

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