Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c716a6b8905d9f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 06:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbfc224aa05958912b0444de72d6ad37 SHA-1: 50b05829fc900fe23575e8d58b517ec1275b5141 SHA-256: 40c716a6b8905d9fe3135c8e40cf9d047b9a2659b8384147d53981a98b672613
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, many of which are on disposable or unknown domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links strongly suggest an intent to deliver a malicious payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/55648434018.pdf In PDF document text
    • http://musicpark-live.de/userfiles/file/filimidulifinegirapef.pdfIn PDF document text
    • http://winso.tw/userfiles/file/lunudikanu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddfcda170---82240098744.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/91092834243.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/27302746614.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/5150006272.pdfIn PDF document text
    • http://weingut-suppan.at/files/64905955900.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/48047401039.pdfIn PDF document text
    • https://thehouseproduction.net/file/49730528477.pdfIn PDF document text
    • http://riph.pl/userfiles/file/84313328507.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/wipufabudafawakalo.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/pafajelimuwidibilekene.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/gobilotariwurumobi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7b9dklesp5i7baamn46ul3gumh/naludezegeramebibo.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/gatuwitisexovemidetusibir.pdfIn PDF document text
    • https://gdaniec.com/upload/files/82695746102.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/rokukekajinizad.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/nizukigasezo.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/nepute.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/4133357713.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/33451890412.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/tupajixapirexefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=simple+interest+worksheet+for+class+5PDF 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_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 19152 bytes
SHA-256: 6a9aeadb87a5281eee6e3ebafbce8db97d0d7fbb5ea2c12e3bfd3c5e90f86c94
font_01_sfnt_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 11132 bytes
SHA-256: 63ca60defed29f3e1a95ef584bcdee8a16f08dda655e6a1d17807153dccaf4f5
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1