Malicious PDF — malware analysis report

Static analysis result for SHA-256 3031d87b16008fc0…

MALICIOUS

PDF

63.0 KB Created: 2020-12-20 20:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8826d9e417b051b4a3974d5041f86e5c SHA-1: f968649edba106d37c6d367920c4f0feabefb6c9 SHA-256: 3031d87b16008fc094f64050c3516f97247215ee466500484ae278b9346783fd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to disposable hosting services, which is a common tactic for SEO manipulation or phishing campaigns. The primary IOCs are the various URLs embedded within the document, which lead to potentially harmful content.

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
  • 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://trafficel.ru/wb?keyword=chocolate%20ice%20cream%20recipe%20no%20machine PDF link annotation
    • https://busununivid.weebly.com/uploads/1/3/4/7/134774072/potafowub_jepipewadere_foranezekivebi.pdfIn PDF document text
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/ddb2d5555.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/5218600.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/6369922.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/xesijibezipu-kutatajoduzijiz.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/10257cac9f2c5.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/bupenafutapepukakase.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/5343726.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/nupugudibogov_mamonager_leton_noruwasivibid.pdfIn PDF document text
    • https://megidawuxuta.weebly.com/uploads/1/3/4/7/134729580/pikurupegaxokemoru.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/varoximu/horizontal_addition_worksheets_2nd_grade.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc557cb3398ff75154b585a/t/5fca93ff87ceb843bde0a94f/1607111682322/republique_democratique_du_congo_actualite_politique.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/radujuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb28bf8-abe3-4823-9dd1-425e9982b7ee/suwesula.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_off0000bc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC44 4900 bytes
SHA-256: 09f9095eddcde4f6bd7c9c2c82605c4aa7da987e450f2c966d7af753afbc78f5
font_01_sfnt_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 10036 bytes
SHA-256: 43ad59a5ad0121e7f7d996f28126044907cb73cfd5e56e6b384f7f948be50949

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