Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50689a8cd285339…

MALICIOUS

PDF

74.9 KB Created: 2021-06-12 06:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e40ecc3a6a0aad9632e1f3e0433ec573 SHA-1: 9859a740f2edde095cb82dea13cb0022ed16d15e SHA-256: c50689a8cd2853393f7e0a225af0475d4179a8864c846c001c55b5a92732a7fc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting or domains associated with SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest a spearphishing attachment delivery vector, leading users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/pbw?utm_term=example+claim+of+fact PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4460709/normal_60b45bca684dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_60c068948320f.pdfIn PDF document text
    • https://zagajewogumemos.weebly.com/uploads/1/3/4/6/134627596/potiviv_muzozivupuz_jelavibo_fagogugepabobom.pdfIn PDF document text
    • https://vedoxugubizo.weebly.com/uploads/1/3/4/3/134348858/9bf6691591.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5fe338a36e38d.pdfIn PDF document text
    • https://xuzonikafu.weebly.com/uploads/1/3/5/3/135351414/nunewadizeguvusiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_604b5603af1cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416304/normal_5fde92fdbb781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_6034132ab40ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_604e8e6a5da2a.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/308613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_605a380cbf77e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_603f58321c750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_60052d13d7174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_603a03ac33d07.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/93567fa1-1545-4a26-b6b8-fc9eaf82737f/tivirus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0edecc45-a56b-4e5c-83db-0facd7effdad/92787161547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b516ebc-874c-41d2-aaf6-e095e2ec38f6/desuzeroletogumusos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98e2e93-3f8b-4fdb-b5b2-a3c0c594c2d5/59760622707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b845e6-6da1-43c7-a67b-e8347d1c3c04/sony_bdv-e3100_5.1_with_built_in_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eafdbccc-73c3-4b2e-aa1e-7e6efed8374a/tebaneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1960e8f-4dea-4ce3-9397-ed13f644d639/how_to_draw_turkey_with_handprint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e44957-9e0b-46c9-9216-0469e8392881/runakozososa.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 4912 bytes
SHA-256: 0f0c76fce207aae65afc203f01d8e7cfe498247448d664c399511ec53459e201
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 11352 bytes
SHA-256: b1d1f80caea2ea4a71e5e1bc708ced1b276264518dca27960fe5de47fe7e29dc