Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b919a77c8a6b30…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 22:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f52b4539404bfbfe5491d2e02f71d5a9 SHA-1: 1145e4cb850aa7ec671b25b4ce984bcc2099339d SHA-256: a4b919a77c8a6b30e172ea96499bfaae308270bb573e0da739cf06b328250aa3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external URLs, with at least one identified as algorithmically generated and hosted on disposable infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://renknh.com/ckupload/files/xudesupewilavomokonawozud.pdf In PDF document text
    • https://estoniapools.com/contents/files/zewikododitafomozir.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/kerefumidodikejomoma.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109071304349594.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/26975543279.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/pefekukitepejixozabofira.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/zomolafu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45f92fedd---julozutomemomogotiv.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/puzifizefatavupesabisixud.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210912071347.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/23288753467.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/novinibukazixo.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2157525756.pdfIn PDF document text
    • https://ocw.tw/uploads/files/83789867410.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/81854523603.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/99832217721.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/53446666226.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/suremejajoteganar.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/dipudoxavukejewajuwufof.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6017a34a---bowaliriniluwiso.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/91977754151.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/voxigotopojani.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/bedusatajovuk.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/80467577240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokeland+war+game+downloadPDF 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_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 10412 bytes
SHA-256: c38407263f52d33dbef35daa91537ba1228e5d7e297455224ab70b1e72ae14ee
font_01_sfnt_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 18512 bytes
SHA-256: 0daaf5574ae57c74f8e0910ab2ee027960d48e7ba146c5079715a0f1438689c9
font_02_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.