Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a28a593ccb1fbe…

MALICIOUS

PDF

83.3 KB Created: 2021-02-04 18:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c6aaf335e9f23a4d12377ea7738ae0c8 SHA-1: f14b11dd046bf49feed5de2a532e05acf4ab8b0b SHA-256: c3a28a593ccb1fbe742dd80e1f121e199708a951c1c6dc5a2b77f101e0eaa0ae
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified links to known malicious redirector infrastructure. The ClamAV detection and ML classifier also flagged this PDF as malicious, likely due to its deceptive content and redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=synclines%20and%20anticlines%20are%20formed%20due%20to In PDF document text
    • https://lekudelido.weebly.com/uploads/1/3/1/3/131378953/ketab-bixiwaxomogi-gejimudoritujat.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/fgDklJM/retrovirus_life_cycle.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/piropifujawekow.pdfIn PDF document text
    • https://larofumizedewep.weebly.com/uploads/1/3/5/3/135326757/f56dab8aedad.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/807997.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/lidivapobud-kededumus-nawogiz-nugam.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/vikupinuwupopow.pdfIn PDF document text
    • https://xibixijuli.weebly.com/uploads/1/3/5/3/135399677/teselepowizevoru.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/dZiiljj/light_up_wireless_keyboard_and_mouse_for_ps4.pdfIn PDF document text
    • https://dukiferuxol.weebly.com/uploads/1/3/0/8/130873869/efb44.pdfIn PDF document text
    • https://vizejuvevu.weebly.com/uploads/1/3/2/6/132681979/324398dde75b914.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/xibihRi/toverutosano.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/eBTdjfe/square_body_chevy_truck_bed.pdfIn PDF document text
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/a0c35e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/91704165847.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 5372 bytes
SHA-256: c24806f16ca3b14892b7f6fe72d840f9037b852d7b369f0c322dc3666fe2c949
font_01_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 12160 bytes
SHA-256: ea8983a972c1bbffc215dd0e43514583614262907113aa69223975314430cb68

Open this report in the interactive analyzer, or submit your own file for analysis.