Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6bf916e2f22d30…

MALICIOUS

PDF

78.2 KB Created: 2021-05-31 03:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06238d2d0c047548acfbb7ceae086bb6 SHA-1: 0f08a251ff1b9b0ad9395375bae8a4f108c60818 SHA-256: 4a6bf916e2f22d30b5cde85b8cf55e0fa8d7cf68da86da512fd43bf6d679634f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to other PDF files hosted on disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and heuristic firings point to a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cdn-cms.f-static.net/uploads/4426416/normal_602f362a7f801.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_60511884f281b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453337/normal_5fe649b5563d7.pdfIn PDF document text
    • https://dolafodapeke.weebly.com/uploads/1/3/4/7/134705679/zejubufer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_606392e29e7ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493881/normal_5ff0c699cf20c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_604e202839c6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494669/normal_6053e96b794f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_5fffe1ed00432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_602975d732d3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_6017c0fe3a9c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450624/normal_60064c8e46d69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478951/normal_5ff96fe2acfb4.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/02798099bcf32d.pdfIn PDF document text
    • https://runobutadafe.weebly.com/uploads/1/3/0/9/130969205/2664817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_5fcc837b80495.pdfIn PDF document text
    • https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/ximigepulekiboganuj.pdfIn PDF document text
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/2ec29c1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=stephen%20hawking%20books%20freePDF link annotation
    • https://uploads.strikinglycdn.com/files/319d8497-f27f-4fc2-b3c1-1683fb32ec91/mevegiwuvojikebajuvon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007f0137-1458-47d7-a034-a15076e3eb6c/xigilizirufokedesokukom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60615271-9850-4fb3-bf06-a6592ae1ecde/similarities_between_qualitative_and_quantitative_research_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a319dab8-1509-459c-835e-8a970b2a64d1/how_to_do_dd_on_penny_stocks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c49f406-b63e-464f-b4aa-43964cebedc6/rezebobibudipudateveri.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 5320 bytes
SHA-256: 8a6eb3b736df230bc0276431527779c034b3495da01f57ddd45c42f6258f933e
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 11084 bytes
SHA-256: 03e4a5ec9507fc675553125644ed4e80c1d4ea7fa94819c70e20cb12539173b4
font_02_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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