Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ac2de210ed114a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 02:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ab96f4791f7f40622b0398ddc88549db SHA-1: 2c1f9b4488ac9576d2b59eaf7be461ed4275b13a SHA-256: c4ac2de210ed114a4ac0ede727ab40de4573acf42cf916312caad01c68fb8774
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://synerhu.ru/uplcv?utm_term=factory+reset+android+recover+photos PDF link annotation
    • http://serdceprirody.ru/userfiles/file/88833436460.pdfIn PDF document text
    • http://bienbao.net/uploads/files/99110898101.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/mevavujuniziba.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/dotazutarezenunajopi.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/fopowusaridojuwowanelap.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/powusezuni.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/doduvizutotukasateg.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/99060340768.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/aeedb2eb2ae6f30a3a41bf6f288cad96/diludumuzolopavikufobir.pdfIn PDF document text
    • http://ciskmv.com/css/file/pakipobutatugu.pdfIn PDF document text
    • https://dasyueshan.org/userfiles/file/87140623456.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/xasadenoveniwugogugisox.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/81382140121.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/9284325749.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/kebiviwenovej.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/pimatanez.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/35310114588.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/tuvifokirifosakazizeso.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/rotapakipiwafipa.pdfIn PDF document text
    • http://geodez.com/pliki/file/zesanus.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/vokeju.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/tipimalazebu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/paxufatawewisi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d512f18bbc---sawafejarokaserisuvo.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/8369035754.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/dosomizizumurepogu.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_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 10720 bytes
SHA-256: a83e5e8caea5530e6e756e526df0a096dcb132ba199b5c2f2f1c5087f6d2e9f3
font_01_sfnt_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 15596 bytes
SHA-256: b310da977bfe21877681f75d48427a6c307afe19670c67ab7cf86d369f19bd93