Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b25ad61b9e80ad1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 04:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 011a96c1bf8345bef92908b34f106077 SHA-1: 4fe02e56b010332c7963e3b07aa7236dd6fd732c SHA-256: 0b25ad61b9e80ad140a247f92d0e278fec61055fac1a2254ae68d7bb42588f22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://terlickodds.cz/www/www/fckphotos/file/27516378857.pdf In PDF document text
    • https://glbtrader.com/userfiles/file/mezudexojelipitofet.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/42224876101.pdfIn PDF document text
    • http://momsystem.ru/public/file/94817332604.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4eaa99c7d---radig.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/56458112785.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/87214661864.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/48358139301.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21594852467.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/19013518464.pdfIn PDF document text
    • http://zzquansu.cn/d/files/watelagifi.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/47776135989.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/23913166492.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/wokuzolonudakuzeboku.pdfIn PDF document text
    • http://badgerhillfarm.uk/posub.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/53531110989.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/jekonukifoj.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/pewekurexopakamab.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/tagoziwibupowubisopobat.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/96154136928.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/bukafaxigupe.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6a0ed0b9946630fb0e39b97dd44b382b/3692447098.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/felotep.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/67335459226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+1+big+city+life+simulatorPDF 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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16908 bytes
SHA-256: 542b61903e7dad7b59fc4538517621b12ee7e3bc6bdde648a256d995cab5eda1
font_01_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 11204 bytes
SHA-256: 010dc0413f0992e0175a6848e9c13ccebb6251499fc08bfca476d4fc58465007