Malicious PDF — malware analysis report

Static analysis result for SHA-256 611c5d6e2450e260…

MALICIOUS

PDF

77.3 KB Created: 2021-09-23 04:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5ec0f3fea257194060b5937b87b8804 SHA-1: e87df59c7244f7b3ff75c60ad2806f155c8d1242 SHA-256: 611c5d6e2450e260f526c280755e071c997094ba0e5ceb15aafaa787b75d22ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded links indicate a likely spearphishing attachment used to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://marljivo.hr/userfiles/file/saregejotanekufulejopun.pdf In PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/28319887913.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142979862fe0---jazejeputokixibawivoto.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/70931916097.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109221805143668.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/nolokokif.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/5385420894.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/62026706605.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-21-13-54-45-54.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/duzotozifojixugokurene.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/63398991009.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/69545687784.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/68739798719.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/38662332622.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/xadugaguvadodesifufazewa.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb0182648---sezasesonepozega.pdfIn PDF document text
    • http://rayer.cn/d/files/3191530010.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/sonobapefopo.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/venazedusokiwitademux.pdfIn PDF document text
    • http://skisun.it/userfiles/files/21266450481.pdfIn PDF document text
    • https://atrax.hr/files/91593725576.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/lexenarere.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/16754395113.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/92962972380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=adding+and+subtracting+fractions+word+problems+worksheets+pdfPDF 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_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 11464 bytes
SHA-256: 312b8abe003aea366427fc2a3d68b64b5206dd3dbb603c403f9cbb9d444770e6
font_01_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 16804 bytes
SHA-256: 046e4f86269ba9a7c18727e8b0c7cdf8339e0bdc85e642eaa4cf7811d8be2f9d

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