Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4309e2343176db…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 14:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b2daaf3a12c1fb25dee117fe9a7484e SHA-1: 242753d7aa61d42923254962ea9523bca3e97d54 SHA-256: 9a4309e2343176db936173684a8971ebecee4f065397702986e0b6cf2accc7d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, characteristic of a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://curvesncontours.com/userfiles/file/bivozesidov.pdf In PDF document text
    • https://hutechsolar.com/upload/user_upload/files/wuxelada.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/kiwexegifizajupusoka.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/11709928435.pdfIn PDF document text
    • http://gabortech.com/admin/file/13893407049.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141130633b95---90350899251.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/delalinajosetenosexarajar.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/8357040146.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/diwixak.pdfIn PDF document text
    • http://grandfiltr.com/files/file/82654338368.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/nafakipizebavaxa.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/panodoje.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/36960490443.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/74728089539.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wevigazapiwuravuzave.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021919238574586.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/fukoxititaxa.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/55496814263.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/70000955357.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/44387453297.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/94486550139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=prokaryotes+and+eukaryotes+compare+and+contrastPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/13193256633.pdfIn PDF document text
    • 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_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 10844 bytes
SHA-256: a54e9af555dd93b54d29b3ff995ca0f7662e2ee40b3c766f07ff91d9fe992f70
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 17208 bytes
SHA-256: f538577cfa855520cf6e803085ca14540858f062f7dfb5b75c0a9b05d4d2470d
font_02_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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