Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e5fa2061b2c7cb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 00:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ca8cfaa446da65731d6360031c3867e SHA-1: 4dafdacf92dad3abc7d3dd75c47162c352f877f0 SHA-256: 53e5fa2061b2c7cb1454325341543650de7453f59efaea0fb509db847c804850
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://jindi2010.com/uploadfile/files/sovisaligemed.pdf In PDF document text
    • http://www.physedu.in/newsite/userfiles/files/34407164421.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/zijisufokobivulipu.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/rurafuj.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/35413532997.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/tonomikoxizevosudi.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/dujerovijatatesagojepol.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/92288350961.pdfIn PDF document text
    • http://cga82.com/admin/File/jogifanodisaparutugupu.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/2140108625.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/60297805013.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/3561100688.pdfIn PDF document text
    • http://holzbau-napetschnig.at/15057388234.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/99241571856.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/16895022232.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/73697852634.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/toxajetitujinevirip.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/7988479814.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/21415473901.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca92f43ca8---28434211833.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/34472971879.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vanadetamigolanisit.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/gifuxanojadewoxazaso.pdfIn PDF document text
    • http://netflor.pl/upload/File/dapij.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/74334702510.pdfIn PDF document text
    • http://skisun.it/userfiles/files/15015608556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+sims+4+download+mod+apkPDF 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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 10676 bytes
SHA-256: 5d204320ccfb0694f0c30274bdb2dbd79507eb76c98135b1e88cf11f916a96ab
font_01_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 17320 bytes
SHA-256: dd4f4f29b9fd07b3a9e149b0ac6ac3ee1a229a764b809f92cc68e45b403be341