Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b55639b657eb76…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 00:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 022d2cd354b5811e2ae4383306c89137 SHA-1: 296b253d4186c905baf1845d4421f832765ad107 SHA-256: 07b55639b657eb769ccc942cb42e76acc761328b9310365bafbcb32986a1d2e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sdhouse.info/ckfinder/userfiles/files/1011654824.pdf In PDF document text
    • https://kultmotor.hu/images/files/63210790526.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9umugb9qkj59f8q10kmuf2irqb/kifaxifowewuzawugeg.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/62769648984.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/54208434720.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/nutifevebelalegemoxofod.pdfIn PDF document text
    • http://jagamimpi.info/contents/files/31263787573.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/mitadewo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141196789014---xuwodobiregewogezuli.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/4102597963.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/guvemewamuxe.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/90444361232.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/18053787083.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109180045344073.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/jetozovusoxobofel.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/3138167322.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/jiwibatid.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/nesalubatawumexedegubi.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/lumobilejuwoluxebo.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/27160043985.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/dutujuban.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/27583338604.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/13397517937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=geron+machine+learning+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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 18212 bytes
SHA-256: 9d8a8f9ee387a11dfda2476e13d06b1ac2a029385c3c2ca8df0c427000bc9e88
font_01_sfnt_off00010b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 10840 bytes
SHA-256: 74f862706ab08dd5c0bea4aba3b07c0922a1ab62fccd61fb826bd9f942483356
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1