Malicious PDF — malware analysis report

Static analysis result for SHA-256 299433853c72a8f3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 22:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd0e694b768eabd8b74f36b0e43938b4 SHA-1: 85480c20889dc0e33ec5ffeab57ea781609dc03b SHA-256: 299433853c72a8f3c02ac8aeb7c94753d377a5988e583f83c75a1f0a0a28c4d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of multiple external links suggests an attempt to redirect the user to malicious sites for further exploitation or credential harvesting. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://auswallendorf.de/userfiles/file/53748173805.pdf In PDF document text
    • https://searchkar.com/ci/userfiles/files/mavozisaza.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/kakolaburutizufewe.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/kedudopemagamatedujimiri.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/45728372634.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ppd7vm0bigb0vinjeh7ff6e75/33219016606.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/97953645472.pdfIn PDF document text
    • http://quinta.cl/upload/files/digatoludobasuw.pdfIn PDF document text
    • http://keramann.ru/uploads/files/bekafadatakenovuxow.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/togopumifegubularamavomu.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/53317951048.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/wezumoxegozupitopobiv.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/ketonarawana.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/nuputifagefexose.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mifuvodapeke.pdfIn PDF document text
    • http://soc-in.com/data/media/files/fadararejugarolidepif.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/daziwadalanebojot.pdfIn PDF document text
    • http://ukrfirework.com/images/file/51756274385.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/moverebukufejipamirebur.pdfIn PDF document text
    • http://lagrupacio.cat/file/4017855782.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/88629193451.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/toporema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=convert+excel+to+fillable+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_off0000cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 10784 bytes
SHA-256: 488efac16c155d0e6054706bba0af0819332fc411771c6f4e575e29ac51a0e42
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 17272 bytes
SHA-256: 8846732be89dc087f24d200657a5febcea1fe22ee7e2a31a4fa42702b7fc47c6

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