Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a42440fa39383d1…

MALICIOUS

PDF

59.0 KB Created: 2020-11-08 06:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f1796c131c5acfd6ca6a38166da6ecf5 SHA-1: 292bafbf70a7af5843ce24aee8db8cd5a914ee6c SHA-256: 2a42440fa39383d18822ae2fe7bb83938123228fe50d14a827ff67b140313a8c
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://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/0b4ed1950b3e0.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://trafffe.ru/123?keyword=florida+land+trust+agreement+form PDF link annotation
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/0b4ed1950b3e0.pdfIn PDF document text
    • https://giwirakixa.weebly.com/uploads/1/3/3/9/133999144/dinerotanogofovuv.pdfIn PDF document text
    • https://refaxezadale.weebly.com/uploads/1/3/4/3/134325555/botov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f873afc5b2f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f8a46597af33.pdfIn PDF document text
    • https://rifodomofakape.weebly.com/uploads/1/3/4/6/134627700/6292973.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/7240363.pdfIn PDF document text
    • https://fawonise.weebly.com/uploads/1/3/4/3/134327557/194091.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/lolijexejomak/how_to_get_unofficial_transcript_cuny.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/crc_ft_bliss_poc.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/57631653929.pdfIn PDF document text
    • https://junevip.files.wordpress.com/2020/11/3898448002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ceb69e-5b92-4232-8634-8b45b3ac624e/39732545316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2e85e7-4b52-44e5-91df-7f395d553022/fevowatapedazubusetab.pdfIn PDF document text
    • https://jenedima.files.wordpress.com/2020/11/ejemplos_de_aminas_con_formula_y_nombre.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_off0000a032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA032 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off0000aa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2D 5184 bytes
SHA-256: 9d8bd268163148148cce8f91bded28b0f125326e31e17aba1a37a1ddc675f6a7
font_02_sfnt_off0000bbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBC 10492 bytes
SHA-256: aa283c7976ee640559cf98d6ff260c061a032a70069f77b2fceb53a1310410b8

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