Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae527d69486a828…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 14:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5aa2d109a274be5f8a5d66c10eba2f04 SHA-1: 84e9c8be9a14c7ea2b8379cdddfeaea2c93fe8d3 SHA-256: 6ae527d69486a82861d2332497b2472c96534bae0fb753a1f4ca3818381a3a20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to potentially harmful websites. The presence of PDF-specific heuristics further supports its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=i+swear+in+tagalog PDF link annotation
    • https://znalac.com/userfiles/file/lurewafavuneraza.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/sobunatedipexanoruze.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/78369252374.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/wokasal.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tugejagexo.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/tufopujezotegenar.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/37973233752.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/12318579539.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/28323763120.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/8063472533.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/sonozexodoturofusimox.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210912224623920.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cotttg4pv0kp9or07qhq0450fi/beboriruwipozuj.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/rogenaxober.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/venifixubulepawituzadawu.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/17383203771.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210912_6FEA1FD364C815F4.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161352bb0020b7---widojodagotibisuwonox.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/81760529027.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/majiwudaperojenig.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/64827484403.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/puzanikinolefekoxiboxada.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/sobosimoxudes.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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 18980 bytes
SHA-256: 1bf5bd86d366487112f5eb0028e919eab17bda16f5c32704bfb55c4740b0fc23
font_01_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 10320 bytes
SHA-256: bf87780ebea2607108595bf74cbf826b29eb08b918afb09e2605f3c989c37252

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