Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b3a37057fc78fa…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 15:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d24a7d7995974f67410d7544b2d2389 SHA-1: 0cd0db8d988cc7b7df29420304c0790ad0508fc6 SHA-256: d8b3a37057fc78fa559ac19e8a96a3cafa0b330ecf2f78bb000597e4142c7ac0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, particularly the one hosted on 'evisiontiendaonline.com', are suspicious and likely lead to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.evisiontiendaonline.com/ckfinder/userfiles/files/42250204007.pdf In PDF document text
    • http://machinegroup.ru/img/outer/files/movenakuvipivudoluxudes.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/tujalutapopoko.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gawusugidebar.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/genibowe.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/nutelemonemufufojokupexag.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/zivuli.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/guvufililopufufak.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/18924676825.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/78821451428.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/pokifowevobafavipo.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/wibenuromaxad.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/6787241735.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/46448274611.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/ripotosofidetogak.pdfIn PDF document text
    • http://prestopc.it/upload/file/xadubidimabekegujapimiko.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/10551573206.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/kadepepesowoduwofefevan.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210924161053.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14ea3f31e---11940690013.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/34033277221.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/21301478228.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/44069616816.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7f2a20834f960e2cd4d53ae5db8a07f0/juxuxojirasaguxajoludexab.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/31425489987.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/zamogiwoduzoxoke.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/pepamed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hunter+x+hunter+123moviesPDF 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_off0000b5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 14712 bytes
SHA-256: 16b6d0687d6305128c793031b420e48e847facc5c7b671331f61104120adc4cc
font_02_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 10768 bytes
SHA-256: 17f64608b5afa1b224592a8c3899a48a4f6564c76a8333b11b35e33f3fd4e6c7