Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c455f760a2a4df9…

MALICIOUS

PDF

102.0 KB Created: 2021-02-13 21:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cfef504624a4712b39ca4988c0943551 SHA-1: 7e6124a2ea9679d3dcd90b3c8f7c3e3e0174e825 SHA-256: 3c455f760a2a4df9ac37c7ba40c88dbad14c4f1d5ec3be48571bedbd704e17c0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=tone+rion+demo PDF link annotation
    • https://gutusalewizewuj.weebly.com/uploads/1/3/1/8/131871657/gavijedediwetidur.pdfIn PDF document text
    • https://musokuvezuref.weebly.com/uploads/1/3/1/8/131871850/85f76324.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/fekezosi.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/7817.pdfIn PDF document text
    • https://zakupiza.weebly.com/uploads/1/3/5/9/135960967/lerajetebapezutofane.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/qojbFYy/clear_virus_on_iphone_8.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/75a906f5151e1a8.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/iaDiehh/easy_recharge_it_now_bsnl.pdfIn PDF document text
    • https://guwawafike.weebly.com/uploads/1/3/5/3/135338161/tamorezupatemar_zovivoput.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/lavupupavedi.pdfIn PDF document text
    • https://lakupofudeb.weebly.com/uploads/1/3/0/7/130775354/zudufaj.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/pabevukar.pdfIn PDF document text
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/pafemalor_pavuwojome_puwoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/jhheY7w/83983898066.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/jg6hegc/astrobrights_wide_ruled_color_filler_paper.pdfIn PDF document text
    • https://www.vocaloid.com/en/products/show/v4l_tone_rTONEIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejifavo/rezifidojesawuzop.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/manualidades_de_nios_2_aos.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/52366651864.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/wonder_woman_bloodlines_fzmovies._net.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015910.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15910 27300 bytes
SHA-256: 55816347b61996a9918f4d4cb8deab8ad937cbf7aa73952c37351bdd80f84d4b
font_00_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 11656 bytes
SHA-256: cb51e5fc3f84743dbb9bce36c5382f66895a6a6963bbedb016cd897addade9bf
font_01_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 4500 bytes
SHA-256: 8ed872c94fcd31414ab2c831657c587252beb0cb0087eadd85d23433c73df0e6
font_02_sfnt_off00013317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13317 11048 bytes
SHA-256: 97f86fe4c7a84719d2683fe493a118a02679cddeabdb26dcc046f088e7a03ccf