Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0b29f258473209…

MALICIOUS

PDF

91.3 KB Created: 2021-09-19 06:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 518009216ef4dfa25c99921426f31fc9 SHA-1: d35557224c2c7a85584d4b2799dad56a88bf1054 SHA-256: ba0b29f258473209dfcaea2d922122f957c9999db168854db09f75b63dae7ff4
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest the document is designed to redirect users to a network of potentially malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://terlickodds.cz/www/www/fckphotos/file/noxurugopujujonolimijelew.pdf In PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/36165260721.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/vasenuvaji.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/weseralerakisotobatog.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39d991407---7840886083.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://teamcode.net/upload/files/vijubitobu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e251ec37cfca40d1440851ffdf12355b/479788348.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/27945502643.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/zirojitipolurelufodib.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/47999781957.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/98289289714.pdfIn PDF document text
    • https://parkettworld.com/upload/files/93815663986.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/97209820350.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/vafupojizexodasegune.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/10843098370.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/42216180799.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/52776506010.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/kunajuxemibowesekukeridu.pdfIn PDF document text
    • http://skupka23.ru/upload/m/widurerevatadelesivoxome.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/nadediwixakipusok.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/zetubemirazurun.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/kopez.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/xazivobarogenopow.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/zezikavokizatezakafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+offline+android+games+not+on+play+storePDF 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_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 17516 bytes
SHA-256: 605f1eb82e90f67c5e32de852a2316010a4f983333bd9b47974994ea5c4f5519
font_01_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 11008 bytes
SHA-256: 28d7d14e52b9a4d81263332d595e503e5c1199cb2ef05d2c132c21e97b6a51f6
font_02_sfnt_off000146f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1