Malicious PDF — malware analysis report

Static analysis result for SHA-256 885954794a0a3242…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 12:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30c855fbf5736cc27b6088157cc21dff SHA-1: 3783fc5f2300cadb08a6c7f0e79d5a5b13a77a8e SHA-256: 885954794a0a32427bd0dbc65c935c53811cfcf9b00ef18a15342c895a17fb89
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tantos.jp/js/upload/files/mekawi.pdf In PDF document text
    • https://xn--b8qxb801j.tw/upload/files/5196879094.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/85709110667.pdfIn PDF document text
    • https://ipmgrouphr.com/uploads/news_file/29756604351.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/48712503561.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/69583222227.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/38131252350.pdfIn PDF document text
    • http://ktcz.eu/files/files/47817380436.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/96834908617.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8d5f9869f2c7b7d9152d38becba62d7d/suzazerafazagabij.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/sezikaxunevitolokeki.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/35895493310.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/54523369705.pdfIn PDF document text
    • https://biocoils.com/img/file/31183164638.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/wadezazatipegorebixasori.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/movusedizivodami.pdfIn PDF document text
    • https://bor-diing.com/upload/files/41821653636.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/84038543139.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/36695090684.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/vesizajaramonifuxilinimit.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f912a343---nabete.pdfIn PDF document text
    • http://halaljones.com/uploads/files/57047881289.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/14258645367.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/24406983663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fortnite+generator+v+bucks+2020PDF 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_off0000b260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB260 10976 bytes
SHA-256: 8a9b8723b3d486ae8d72e5877a05945e8cc388fcd43da8c25422f05e648a753e
font_01_sfnt_off0000cc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 14744 bytes
SHA-256: 7917954732eef2450a10354b5a2a50db2abacfd58278f274044eb8d46bdeebc6
font_02_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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