Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b59b375d5cc715…

MALICIOUS

PDF

93.1 KB Created: 2021-05-22 09:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0670b6756f021806c1cbd25ba2f4d1ac SHA-1: 5f2441c00f74a6e39e2632db553bce83edc9331e SHA-256: 59b59b375d5cc71535736a08147b6af7343ef61514d4027a4abd661cac5e4adb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. 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 embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wb?keyword=dyson%20dc41%20animal%20brush%20not%20spinning PDF link annotation
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/degexaz_pibewuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5fff2e3502014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5fcd882b28274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_60310fe7af062.pdfIn PDF document text
    • https://terowibew.weebly.com/uploads/1/3/4/3/134370771/kexevamajiron.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/ronazulipafeg_javakaluwupevim_jumijoxeze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5feba30a9f464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_604876dc17496.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/96c5df21b47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5fcb2dd47ef3f.pdfIn PDF document text
    • https://tujazemedup.weebly.com/uploads/1/3/4/4/134473975/doxasoxorarij_jezij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/010992c6-cdd5-41e0-8d91-175e220dde06/64616093165.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/weber_smokey_mountain_cooker_18_inch_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141f7852-d768-4340-89a9-e0116c3eabd1/big_green_egg_prices_at_ace_hardware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cca0d69-2479-40af-805b-b0c63462ec0a/patim.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/58539605289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707bd9fc-df15-491b-97ac-d4874dbbc9b4/14665227503.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/88069095120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b44039a-12b2-4b7a-b87a-c4d41ed70eb8/canonet_ql17_giii_service_manual.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_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 5868 bytes
SHA-256: 171adf7c39d41725b1f533d63f3809869e6fde5685afa850240efce315b60793
font_01_sfnt_off00013dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCB 11600 bytes
SHA-256: 716d0d66a0faf743a8bdd8ff9513294122639e119b2bf42d88768594574abe4f