Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdec5459cc53a635…

MALICIOUS

PDF

80.7 KB Created: 2021-06-14 13:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c8c1322dc80dac997eb33f86fe3b6060 SHA-1: ca4e45fb7b3bc4fe1fd629e2642143f141daa8f2 SHA-256: bdec5459cc53a6356863bcbc6e339234f102a6589b93bdfb5d057e86939ece19
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=simplifying+radicals+maze+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444875/normal_605f58156cc4d.pdfIn PDF document text
    • https://poxunafit.weebly.com/uploads/1/3/5/3/135330231/dilevenusuwozunor.pdfIn PDF document text
    • https://janilunulosuga.weebly.com/uploads/1/3/0/7/130739392/1b414c1a2f35.pdfIn PDF document text
    • https://maxifabosogup.weebly.com/uploads/1/3/4/5/134526580/wedopibuged_bepapenabit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_5fdc27713fbb4.pdfIn PDF document text
    • https://mufunada.weebly.com/uploads/1/3/4/6/134623537/durelubizigujafok.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/9923070.pdfIn PDF document text
    • https://bekaxerovesujes.weebly.com/uploads/1/3/4/8/134856890/17b5ad29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6037d43bb11af.pdfIn PDF document text
    • https://sizegetode.weebly.com/uploads/1/3/4/3/134309939/mugori_memilotepakogun_morusiwuwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_600072e63bd14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488314/normal_606a5f7638600.pdfIn PDF document text
    • https://bexajaburise.weebly.com/uploads/1/3/5/3/135345802/d7fb65c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_6015472230492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_60640042233ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suzojadek.pbworks.com/w/file/fetch/145071984/nevulum.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/f/avatar_the_last_airbender_comics_smoke_and_shadow_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13767864-e49c-4d21-9181-b610153b3ad2/mezedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8931ce16-d36c-4511-af1b-3d9d281ef37d/samsung_vrt_plus_washer_code_fl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d5b3f0-452a-4cbf-900e-700efd61634f/ridifenupafitaxexugikago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2265e86e-f1af-43df-8168-aaff9a44f22e/how_do_i_reset_my_rain_bird_controller.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://scripts.sil.org/OFLIn 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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5820 bytes
SHA-256: f99db6c26c3ea8570b14874c2f7374f14eb54a2abc3c8e557d29873a4ade3960
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 11296 bytes
SHA-256: 0f16bcabf9b0cbf9d573df5b01c9f4b784b52e9acde90dc3295ea96f1e88a972
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16256 bytes
SHA-256: 75675c9368796270a56e3a4765899b6233e52395a20149b643afb13bf0c8d099