Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8453011e70be3e…

MALICIOUS

PDF

73.3 KB Created: 2021-10-04 00:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1bd17a442b6793cd3808cb32251c2bfb SHA-1: 4afe1290cc9221ecd742329782e3bff784a395f9 SHA-256: fd8453011e70be3e4d6f6f90f14ab2ce282fe2cdde97d8fae0a1dd8119da2652
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The ML classifier and ClamAV detection strongly suggest malicious intent. The numerous external URLs, many of which are hosted on potentially disposable domains and appear to be part of a link farm, further support the conclusion that this PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cybernet-ap.com/UserFiles/File/motolevozukoni.pdf In PDF document text
    • http://ceomit.com/fckupload/file/86162979137.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/kusew.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/44241647128.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/24451945138.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/57483596161.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/vijimonexijukanuni.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/23841913503.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/wizukumojola.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/37998689165.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/repuxokefofuvo.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/sategaxitege.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/tuxetazul.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/74287705428.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kagewujuragudetizomamos.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/81663602878.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/gizofeketoxakukalupak.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/81912638362.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/48152660862.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/madefupapaves.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e9ebccc7a7c070a8a6a76b0d4823e551/83437963856.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/lutanuzezozujenapulizo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5c80eec889fea8606655d8f2297b9011/boxigatobofad.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/59802076554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=1+gmt+to+pstPDF 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_off0000b909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 9912 bytes
SHA-256: c3a445360b2521a61862a6fd4ac91641e10c4b62c4235e13966b81b86aa62c3a
font_02_sfnt_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 18692 bytes
SHA-256: 61f721ad9452ff65f3417e54bba3946bf91cac767ad6f2ab728a83d40787bfb4