Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e39beac56c5857…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 04:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1652fb828678a4062c4b9f0cdd7714a3 SHA-1: f3c1f3266b56b3947c8d635fd04ad1ca9d9c09b7 SHA-256: d4e39beac56c5857b6f380a889243f632dac545815c7fd7e6f3e4a3657fbc785
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm and contains external URIs. The PDF document body is heavily obfuscated, but the presence of numerous external URLs suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and external links are indicative of a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/uplcv?utm_term=how+do+you+say+does+anyone+speak+spanish+in+spanish PDF link annotation
    • http://lsmtrontractor.com/upfiles/file/20210903113824.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/59839206165.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e13d2e6d8---34330864715.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/84110325255.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/zepifosifukemoz.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/48445594439.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/jimovezutakimetuse.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/4430529618.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/01ce6f9b4274d7fe87758a3a45ecb7cf/gerapotugefakixelopexef.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/17830068610.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109231448472589.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/josajakegonubagut.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/nukisajoluzepupimixuravez.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/25314420069.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109040355317096.pdfIn PDF document text
    • http://kotolantopeni.cz/file/13684161934.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/poverazuluvoluveriwetuti.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD9 10628 bytes
SHA-256: 6bf6e351ca211ae9cc724dab85df58d43991eac5f367ebcd34df0a6f100fa4de
font_01_sfnt_off0000c31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 18356 bytes
SHA-256: ffb42fc37a03a978723274ca736498d62f970784133e0efdc8c270b500551f1f

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