Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fb783294e0495c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 05:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68dcbd7111caffd15d08629ff7e23d5d SHA-1: 813b25dd6ac1691d5ea7997eb56c87dc0e4b8fc1 SHA-256: 94fb783294e0495cf5f60ab2280d9cbd2544bb1ee237bcb3e80733dc559d9e99
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI heuristic, which is a typical phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://autoscuolemontagna.it/userfiles/files/vofugajavigugifejifet.pdf In PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/26401422680.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/fakugopi.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/78963866871.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/meduvesojexur.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/47353937949.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/43141613607.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/vasusupek.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xotafa.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/geketugexizupodabipoxub.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/82922551801.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/liserixoxawoxenaxerag.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/wirijedofibawimejowaxoda.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/lutuge.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/gepefaluvadimivomaxu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908061322510931.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/83076737805.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/gadijexilake.pdfIn PDF document text
    • https://swiz.eu/files/editor/61526127940.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/82347889478.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/remafefo.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210905_A7D5187703E78897.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/64972181483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=is+amazon+firestick+legalPDF 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_off0000b01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01A 10784 bytes
SHA-256: 9e38192f69a4ba1d3fab44af5786e2b10eac3fb3a28f811ba722865b729250f9
font_01_sfnt_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 15652 bytes
SHA-256: 55c9f889a18ef3a3ea5197ba104711e08e720a2f8c5f1bf87a2b980feaf0da1d
font_02_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1