Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6539a00fad1068…

MALICIOUS

PDF

64.7 KB Created: 2020-11-11 19:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7f38088cd163c22253d4dfe368b74ba8 SHA-1: 18477292aa009c2e5ef31a2fe372fa99e1cec014 SHA-256: fd6539a00fad106805b5a4a93facc321ac05bd6ec627c215a2f1dde0b3e795ca
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF documents hosted on various disposable domains. The heuristic firings indicate this is a malicious redirector and a link farm, likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

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
  • 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://gettraff.ru/123?utm_term=lowes+near+me+claremore+ok In PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/3271769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5fa86f2cd196e.pdfIn PDF document text
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/jekorasutale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fa2ffe2165c8.pdfIn PDF document text
    • https://jefevitekigo.weebly.com/uploads/1/3/4/5/134586767/6969648.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/4562352.pdfIn PDF document text
    • https://powizosiki.weebly.com/uploads/1/3/4/0/134041047/perip-kobofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5fab63e5b81e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f8f85f5e77e3.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/6262092.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/6884331.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/pozokimepe/64017128192.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_off0000c348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC348 5044 bytes
SHA-256: 1bbc0b64537c3f35d1c80c44bee3139a5cbe968bea60a7dd7cfe5532af74d2ab
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 10056 bytes
SHA-256: 533a7662f4d8a7d17912683b80e0425448de7812558cb7ffae6f8bc3080d64f1

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