Malicious PDF — malware analysis report

Static analysis result for SHA-256 670d1fc1db26f9a5…

MALICIOUS

PDF

40.9 KB Created: 2020-11-05 20:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 0b6f860907523113303b818d49fd8f9b SHA-1: 5688fce51fce451ab54aae65a009aad639d8ba6d SHA-256: 670d1fc1db26f9a5a47d8c5f112e190743e841313b5b257aff43d6d4afe7f0ca
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffset.ru/123?keyword=microsoft+windows+10+media+download+tool PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413017/normal_5f9b22351760b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f97be26dbaa5.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/tapirerurapomibutar.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/c8c60ce6946848.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/pesovof.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/vevikixupigosotidad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fa3224718b41.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/6a123d29d56f7.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/pojojagajevuxa/94831074143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a87f215-c037-414f-a749-0507df86a976/20663570974.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_off0000615e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x615E 5456 bytes
SHA-256: 8c4edef634e6c47252e7c8622e0fa1bfd38404b61df24b08aec1c96117575fb5
font_01_sfnt_off000073f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 10256 bytes
SHA-256: 35efbb5ae061f8d9f7f283eef1f8302e3728036cdf10dd011a4497dfb11ee8e1