Malicious PDF — malware analysis report

Static analysis result for SHA-256 5123e39a1d58e356…

MALICIOUS

PDF

50.2 KB Created: 2020-11-06 23:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d0b8957b085618976ddff2e21e69a61e SHA-1: 3d3e09a21d5910c06eac59d2e72d15faa819e85e SHA-256: 5123e39a1d58e356102b99be394b6ae7434cdf78d7c7742b9949278f09ac0282
236 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdf.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/aws?keyword=fortnite+free+account+with+skins+password+ps4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447630/normal_5f9fa8abf25e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_5f9687edaf910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_5f924b7f3607b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_5fa43cd550334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f93437247b8d.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f8bac9d9b5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f878c6450b9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zegasaxum.files.wordpress.com/2020/11/gerumiwaj.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/joindre_deux_fichier_ensemble.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/b_m_sharma_physics.pdfIn PDF document text
    • https://danusodemoza.files.wordpress.com/2020/11/nutuxolalotab.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/who_is_in_the_vanossgaming_crew.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/61055452828.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/iron_carbon_phase_diagram_explanation.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_off0000758b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758B 5408 bytes
SHA-256: 555348668cd62b90384a5e2778402c5c55c654c8a265076e5b123505482267cb
font_01_sfnt_off00008803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8803 2140 bytes
SHA-256: fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2
font_02_sfnt_off000091dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DD 12132 bytes
SHA-256: 7b18168bd4b49d0a94c8ffc4fa8656b1abd67ce31f687da064fe00dec000e69d

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