Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5302a672d6cc4a2…

MALICIOUS

PDF

41.0 KB Created: 2020-11-06 19:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 375d5fcb49973827b3209d1b5e733ea5 SHA-1: dcc8897a0d223f5af8a9abece3f1e12ea9b50b3b SHA-256: b5302a672d6cc4a2ad17756930b597865142c480af82304a7098251391d8016c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. 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.
  • 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://trafffi.ru/aws?keyword=pescadero+california+zip PDF link annotation
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/bikevokuluvukiwibo.pdfIn PDF document text
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/siziwaga-lofik-tavexow.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/4687962.pdfIn PDF document text
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/rulixekax.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/jeworurowam/do_lizards_bite_wires.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9789ae-ab6c-49b1-bfd5-85073c767e99/nejurojusilom.pdfIn PDF document text
    • https://tirosagumeta.files.wordpress.com/2020/11/12005768388.pdfIn PDF document text
    • https://dutekosakiwe.files.wordpress.com/2020/11/nutrifit_digital_scale_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/police_oral_board.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.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_off000051f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51F6 4908 bytes
SHA-256: 230c6821cd956398aafe3a9e40bf03250cc5e78bc29f2cbb218e9ed593a5d0f3
font_01_sfnt_off000062a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A7 11408 bytes
SHA-256: 50f0c24686a0f69f5a59950314ba5ed27513338387f7a1f5e515eb3e59c65789
font_02_sfnt_off00008994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8994 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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