Malicious PDF — malware analysis report

Static analysis result for SHA-256 093ae39a06b6f4f5…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 01:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a42297bdc3c5b9c2cb9ceb7b80f85d98 SHA-1: 7475490468edae1fb11294dc36c028e08ea304d3 SHA-256: 093ae39a06b6f4f50697814b595e17fc52a68923b1fb4b784f41c7fbfd3c437c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the PDF contains a link farm with many distinct hosts, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0r29g054j0mptfupvuj6pi0ei1/72074352435.pdf In PDF document text
    • http://banglenhospital.com/UserFiles/File/pivarozixo.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/paratuzaju.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/15022776305.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/lanezukeza.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/linudizirutedeji.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/38645527506.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/zaxizunowadunizadakabe.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/nuwususisin.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/zomeg.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/nifoj.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/fovoxilowupiwavufiw.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/46589199319.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/turitapibaxum.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/40557004816.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/86125466771.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2bd3347d1010bb0e53a5182fd6a66818/79117348626.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/22476132482.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/wexikugogavowufabubi.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/35853187782.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/xutodaz.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/44993223766.pdfIn PDF document text
    • http://immopolignano.lu/images/karajaxibubadikevanena.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/5c7bfadd855592f87481f9098cc0fbbd.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/97718468350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=3+eastern+to+centralPDF 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_off0000b055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB055 16500 bytes
SHA-256: 9f666373dec5252b725f78f8115513f8a85f0ca4087357c73ad3bf4fc6e4d572
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10208 bytes
SHA-256: 55e21ea548cec44ec42a2595641f5fa723851aad44c4edb285107f2783de5e6d
font_02_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1