Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b5ad91bb562868…

MALICIOUS

PDF

79.9 KB Created: 2021-10-04 12:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e8b65a8ea07f2333b54a0aafd43b74f8 SHA-1: cbbe0830de281a0e0491eb3d01f6e99a11a58894 SHA-256: 05b5ad91bb56286812b5b43cb9e2e823ae7e0428deed871774d4cba22dd70e9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to create a large number of links for SEO manipulation or to host 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 https://hunghiephuylog.com/upload/files/39496676638.pdf In PDF document text
    • http://goldmustang.com/files/files/moribanobojetajone.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/29701298482.pdfIn PDF document text
    • http://splogservice.ru/content/file/zubel.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/41937562250.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/ragabojotijureterofif.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210926201946.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/36899950127.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/dovozatelo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2aaa20e2b46efe63c31056e52befeb51/32653723180.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/75293796604.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88187932927.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/jigukafu.pdfIn PDF document text
    • https://cicimanis.com/contents/files/bubiwalekono.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/fataselupit.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/86789333748.pdfIn PDF document text
    • http://snsi.jp/image/news_file/samumalagewoderoxelup.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/luguz.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/dijabuj.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161567c66eb56d---71248553964.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/58937390895.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/81898915981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=surely+if+you+want+my+love+lyricsPDF 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_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 10936 bytes
SHA-256: 75d595a5ddbb57967b2032678ce7964056aab741235ae740a946a09e3c9adf37
font_02_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 18320 bytes
SHA-256: 646dc6482897ded4e5aef1ff995c742a19a0dc7a786c5c456957afa8d9fd9527

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