Malicious PDF — malware analysis report

Static analysis result for SHA-256 450fcd54b5f26887…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 17:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0ae2b37287f1b8c3fb53771acc7e199 SHA-1: c7bf04e8b6497139d9201455eea677b7a5766a33 SHA-256: 450fcd54b5f268875604ac106fefa287461ea01bfee9935faa82d6b3808d2e00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to facilitate phishing or distribute malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/aef5ed2cee4ba13c95488bc9418a9323/35820393823.pdf In PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/97953645472.pdfIn PDF document text
    • http://svx.su/ffile/file/zotuxasodigoleruwoxo.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/lebirorali.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210908035314.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/63124010753.pdfIn PDF document text
    • http://strandedtattoo.info/file/depovud.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/14489875243.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906061528388.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/93715967149.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/poketuwafijagesexotuwe.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/rajowajinerunuvinulipox.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/87524018670.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/bekasitu.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/46236017301.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/71990001535.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/binavasuvazazezodawutidop.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/jivigorobusedalujonoxeba.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jolugikozidalelasafi.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/92862269839.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e9mi8ud73npcg1co39obnc4eo8/wutoro.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/3481933348.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/68858288978.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/xefejaz.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/kakupanisinatamojexivevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a+first+book+of+c%2B%2B+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_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 18916 bytes
SHA-256: 849d51cec58b490caf6667fc61db2997f051ec8aa9fb270abe851966120193ac
font_01_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 10384 bytes
SHA-256: 7977e036ea1f54a44a47e834c78ba2842c71e86f8b3f955501d28925ec5cbaa7