Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d34b4f4537fd7a…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 15:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8dc8c25c2240527b63f224f0b3cfec36 SHA-1: 30b89f6785bd30490a6f2e6a2d992389e9c1807d SHA-256: b9d34b4f4537fd7a66d6ecad572359471bb40044a14762175dc5d10e2b104835
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://smidgel.ru/uplcv?utm_term=watch+rurouni+kenshin+live+action+for+free PDF link annotation
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0375e018969eb9d2e12fb910b93bcfc6/23773388718.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/jawowujagomoru.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffa24c539---52249296391.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/nisadisigepotizijiwa.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/jirujovoji.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/36021044090.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/19381566141.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/roxemixeralodesukuvopame.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/41503733288.pdfIn PDF document text
    • http://jfe.hk/userfiles/77892823116.pdfIn PDF document text
    • https://wsbtitan.com/images/file/13192670848.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/26149536629.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/futalulinizatuderekisefu.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210922040227744365gxp2w5.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/54615992535.pdfIn PDF document text
    • https://anfauglir.com/images/file/woworogiluzodeturonaworig.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/91572355832.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/rodemimoperidepuze.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kisotime.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/97250638934.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/pezokidebolofe.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rebepux.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_off0000acf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 10684 bytes
SHA-256: b74f8eb6767a5f28087f70533d01a520f5f8af80359c65201b2ff74fb8cbc1d9
font_02_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 14808 bytes
SHA-256: cf6b4f9d15a3092baee67f3dc3ecc19248a47da3fb8931996ec8a25d0d159a4e

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