Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dddc25e39bc1586…

MALICIOUS

PDF

78.5 KB Created: 2021-04-29 14:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f53e77cc3a90911072baa512576c86ac SHA-1: 580834ebe44bd983ddf8160e09200b32169520aa SHA-256: 6dddc25e39bc1586a479f96199f0507893e46f9828fdc3f2648ffb0875e639ec
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://soxebez.ru/strik?utm_term=how+much+does+a+swim+spa+cost+uk PDF link annotation
    • https://cdn.sqhk.co/zegapoxasut/5hcggia/mexibowavovowegifo.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/jbijhaL/najipipoxalokikixamif.pdfIn PDF document text
    • http://zokuwazuza.22web.org/isometric_paper_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/ejZXgjD/gedavifutekatijunafoxavi.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/hYddjfb/babewexefofavi.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/xFsJdic/nowikegusifudinulim.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/cwhfiam/tamuruxuxek.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/gd4hfjc/titukawozunizib.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/WvibjfV/warframe_necramech_build.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/8d605caf-c165-43ef-9b57-19928c66f45b/eurydice_sarah_ruhl_character_analysis.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_26f8a0149e3b45d4b961da568ed8d25c.pdf?index=trueIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_f2b95e8d3af044bcb950e5e918520354.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e15ee90-13f6-4ec2-9afd-5aa4e0f10a49/m_audio_oxygen_49_pro_review.pdfIn PDF document text
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_e5ead54072ab4622ac60de02df389401.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f892265a-3ad1-48a5-a5c1-e4a829a4ab20/88397293767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09d6dfc-b54a-445e-823f-61b73d6ac4d0/pirilesifezara.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_ce80b2eb61954dc2a4cdfecb21ab8549.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6727d1-6f69-401f-bcd3-d0d085ed48d0/xisolumi.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_307015dcee8a48c4bee46154ab224c85.pdf?index=trueIn PDF document text
    • https://71b34470-2e60-4936-811b-9f14cb47e32b.filesusr.com/ugd/1dbbf0_432d582c80a9439fb9d12fd8c922c1c4.pdf?index=trueIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_332f9a63c1114ecabe5e619de7d7a407.pdf?index=trueIn PDF document text
    • http://suzutinidoxuvim.rf.gd/auto_login_in_android_studio.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_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 5300 bytes
SHA-256: b533a1b5f843841f0911c2d79e0dfb0d77aa0eb562d7b5bddb819ee91f2a272c
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 11328 bytes
SHA-256: 4803fccc8c695ab0fddc25b0bb9f89c9ee1c93be9a1b834d136a7e5e1715b348