Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3ba84be850833b…

MALICIOUS

PDF

48.2 KB Created: 2020-11-05 19:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 898252fb8e08c6a0f82b5cef4dc0e211 SHA-1: 9560908cca2140461fb10a3bf1b7818391abd2b9 SHA-256: df3ba84be850833bd4363186719939c8327e9d2581987d6270b928757ce98327
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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 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.
  • 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://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/3ace41b443562ff.pdf.
  • 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://trafffe.ru/strik?keyword=ctel+study+guides PDF link annotation
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/3ace41b443562ff.pdfIn PDF document text
    • https://nijelulegokep.weebly.com/uploads/1/3/4/3/134318748/08538c043b7ce8.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/3809296.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://uploads.strikinglycdn.com/files/439ca293-cd04-48b6-af11-173bce5135d5/76352244502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7269/1099/files/63237598086.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/los_actos_del_hombre.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/jbl_horizon_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/mafumurufizorefa.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/60810134705.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0623/0168/files/whatsapp_plus_iphone_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/define_acute_coronary_syndrome.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/12379450550.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000714d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x714D 4480 bytes
SHA-256: 8f30882dbc44ed4b8f42f928ba2261d70512730910da1abf342f461ce5f17bc2
font_01_sfnt_off0000809a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809A 10964 bytes
SHA-256: 5b3d1278406f48a402bb413c326a5b9b7b03befe81349c0a6d5bf232bb5c6348
font_02_sfnt_off0000a5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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