Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aad0cc1af104bd…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 01:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 466bcec227a1536f5f0d027defab3a80 SHA-1: 5ee3101b070077f87624590b4d4ecf8be20a2eca SHA-256: 72aad0cc1af104bd057f560e6bb6859e1ee894b3ead79583cd031b14be7a049e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. No scripts were extracted, but the structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://marcth.pl/media/fck/file/latilukupuko.pdf In PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/tuboratu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/kitufumavedobupemom.pdfIn PDF document text
    • http://only-svet.ru/upload/files/ropute.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/17044896596.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/32349736369.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/48671940100.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/23811056197.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/99666340340.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/96360608619.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/vavonibifove.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/fomumanosot.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/69765637453.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/62010038434.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/pabejimotosofenusad.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/borewebuj.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/sobuval.pdfIn PDF document text
    • http://nenorm.com/files/files/9215974611.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/roxevite.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kovupegididokal.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/jaxenevugasibezejono.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/tozuminikurusudetovawagot.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/65779418643.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130355e0647d---47840539896.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/27311177202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+bootloader+menuPDF 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_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 17576 bytes
SHA-256: e5a8a89cf11f35c1ce905926f7f0eb7cc296852295f5342279f18993a6ac5832
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 10460 bytes
SHA-256: 62f9e720fb502d03d567174ec0a18764ec56aaee8aa76a9a4bbdd47a103277a1
font_02_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1