Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c9d5a73912224a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 21:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8896f18f0e08d1425b2d61ff9f41e1f1 SHA-1: a4887afe6547b71c6d4a44f0db7fa62ae1b978f0 SHA-256: e6c9d5a73912224a6e3bc03f59a826a4bd586f702d8467262ca8139217286d81
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the classification as a malicious link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/25572401728.pdf In PDF document text
    • http://balcimimarlik.com/resimler/files/fuvilesodudulavade.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/xuniju.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/62354669542.pdfIn PDF document text
    • http://elitk.ru/_files/zajetodape.pdfIn PDF document text
    • http://scro.ru/pic/file/mivibokinijomubebiba.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/vexef.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/400100c86028191886ac75b36e063f4d/70061997187.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/65727674332.pdfIn PDF document text
    • http://chinazzjx.com/d/files/25368151935.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/42852984746.pdfIn PDF document text
    • http://lovesenergy.nl/file/jixelifatetiporoninat.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/60773262399.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/42520631229.pdfIn PDF document text
    • http://shahgrp.com/uploads/jonajazakifirisudifota.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/69226278932.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/22992592183.pdfIn PDF document text
    • https://angkalaris.com/contents/files/tizufuvivajujuzejofowev.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/jebegini.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sivugin.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/41495502393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lego+jurassic+world+free+download+androidPDF 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_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 10828 bytes
SHA-256: 4b8ce98fcca47491ce7c036fef33ad4ca2b29688b7f099e6ffdd26215cc6fed3
font_02_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 20052 bytes
SHA-256: 4ca5959628bc22141404e2a973d5454c09d2e91ca0d2fbad8591f4636fff8839

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