Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d284913765ed160…

MALICIOUS

PDF

71.7 KB Created: 2021-05-21 22:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: db074530b1d4beca02eecde7330a65a1 SHA-1: 6d89e5475a815ae17da2795f15f1cc0fdf3eb805 SHA-256: 4d284913765ed1600c6dc1f3ffdb5321571be66fb8919be4b0009b5acf0da1df
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=dehleez+pe+mere+dil+ki+mp3+ringtone+free+download PDF link annotation
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/zadovedomefolitev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_5fda88e26a17b.pdfIn PDF document text
    • https://nakotibuvifotog.weebly.com/uploads/1/3/4/6/134619478/genemurobizu-mupixupelelage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_5fd90b276ad44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_5fe6f9b857703.pdfIn PDF document text
    • https://negofajosodin.weebly.com/uploads/1/3/5/3/135314147/bifilesexeb-vobowafaridodog.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/59f6473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_5fc5faacc361b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_604ef037befe6.pdfIn PDF document text
    • https://sozazoje.weebly.com/uploads/1/3/1/1/131164180/614fa4c3aff.pdfIn PDF document text
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/xilepuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_60514a91b03a4.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/9542585.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/pivaduwaper.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/7c3b77b313a8.pdfIn PDF document text
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/xabixunepubewuduwa.pdfIn PDF document text
    • https://silatasetexa.weebly.com/uploads/1/3/1/6/131637876/domulus_lelom_xolenonubakawix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5ffc117001346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446772/normal_604303e020b4f.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/d393b540-4fdf-4240-9591-c5e7895cb42f/59929321753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6869fa-afb7-4204-ad2c-cc9642695e79/forevajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9ab10a-01d9-495c-bc78-c29a98715a8b/patatigorinizexatumave.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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 5644 bytes
SHA-256: 722a0e125a7a41a8676f818d547537f1499a6cc3f00949e7536fc81d57ca241b
font_01_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 10712 bytes
SHA-256: fef2839ec4273caa01ef8ef37edbabf2b4cea9a8737f1ba5f81648c2f8089fcd