Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa494e4fa0a9e7b…

MALICIOUS

PDF

44.0 KB Created: 2020-11-06 02:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 13c9884e5ad4b2e159221ada6c45c087 SHA-1: 5a45bf80635fdc17938e0a38a379c862d7b473e0 SHA-256: caa494e4fa0a9e7b6a72b18a6b615573316a89f21db0bd0582bd12bbde5ab664
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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://xulopoxaxuwuzoj.weebly.com/uploads/1/3/4/5/134509354/zonug_paviposi_belejowosa.pdf.
  • 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=how+to+to+hack+someones+facebook+account PDF link annotation
    • https://xulopoxaxuwuzoj.weebly.com/uploads/1/3/4/5/134509354/zonug_paviposi_belejowosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406228/normal_5f94919a39fd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5f9ffb5fce345.pdfIn PDF document text
    • https://minikugonon.weebly.com/uploads/1/3/4/5/134500064/8143725.pdfIn PDF document text
    • https://xabisemegebo.weebly.com/uploads/1/3/4/4/134491474/e1aaeaf0.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/9402018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f9b48a67154d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454670/normal_5fa4919f2db74.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/9463824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5f9f5ea214fc0.pdfIn PDF document text
    • https://vemowidododujev.weebly.com/uploads/1/3/4/3/134353566/jutekagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juliziwojatige/song_lyrics_above_all_powers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6344b333-b23b-41ca-91dc-4793cc48e980/wisobiw.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/blessings_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/faxenixe.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_off0000611d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611D 5084 bytes
SHA-256: 3e07a60ce6f0e911228ec7ee994b9323b301bf88473cb592fcc22918ef173861
font_01_sfnt_off00007253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7253 10180 bytes
SHA-256: 10aed2880cc3de3ce8560d00584aca11c12f2cfa80692e230cc0438c500f1a0e
font_02_sfnt_off00009523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9523 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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