Malicious PDF — malware analysis report

Static analysis result for SHA-256 304f2a5389fb967d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 00:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92cde2e089ffc09d58ee2541434146ac SHA-1: 8dcc4adcabca09260d84e3dc1ac1e79b46a81ac7 SHA-256: 304f2a5389fb967dbd62512b6d0c011f4812dc48dff4351af2235b64b267a958
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on domains that appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://partnercable.hu/files/pozewufukowof.pdf In PDF document text
    • https://www.thaiahpa.com/flash/files/87320298026.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/bafogavoviwolij.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/dubepepero.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/14249312991.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/31196113339.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/saneluvifedibisovuvi.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/89119226673.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614656650e894---57840995285.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/gexunigidejage.pdfIn PDF document text
    • https://areicon.com/images/file/31631043542.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/sekabiduwedevovolutenodus.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210916195116.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/12813599657.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jubizowepexumuvadokejuzav.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210916183149_slk3a7.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s28kdivc4r6qicnvaueh5b8jtl/famajixaxaxototomifub.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/45650418198.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/rulesufikoj.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jewizigixum.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/64819362891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+template+papercraftPDF 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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 18748 bytes
SHA-256: 488d13b04157cc408c49e3a81424f8fcc71b3327a915d0c99da9a82f6ff81b36
font_02_sfnt_off000131da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DA 10608 bytes
SHA-256: 6fbb8054fe52363bc57b2bf8c84c1ccda38b8dd99135342f9300ab4e4cebb53f

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