Malicious PDF — malware analysis report

Static analysis result for SHA-256 45921d08b987289b…

MALICIOUS

PDF

51.9 KB Created: 2020-11-09 02:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a0f1fa27016ab1c1c05c2c87d8008056 SHA-1: e661f5999b16a2241d20fe1290adac3966e38a01 SHA-256: 45921d08b987289bf910b6d570bf28b76876b585e5ab17f0a5dd7144e4708000
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though obfuscated, also contains URLs pointing to disposable hosting, suggesting a link farm designed to funnel users to malicious sites. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?keyword=vietnam+war+conditions+trench+foot In PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/06fe18c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5f9a0316241c9.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdfIn PDF document text
    • https://loraxero.weebly.com/uploads/1/3/4/3/134332649/fujofuja.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/89f91eb.pdfIn PDF document text
    • https://zojajodasu.weebly.com/uploads/1/3/4/3/134354616/489528b31af763.pdfIn PDF document text
    • https://tiwovukixata.weebly.com/uploads/1/3/4/3/134314311/xefodavejos-dawufowokek-potikupeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_5fa6b48b04786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5f987f820ea62.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/ffe09e9a-b2cb-4ea1-8af6-6fa5ac32f1c4/84817491171.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/pifagexonaz.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_off000080da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80DA 5072 bytes
SHA-256: c851d76e3ce75591276132b33b59f3ca4149db3619ed8abbbbe913abb8f8af8d
font_01_sfnt_off000091f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F8 10256 bytes
SHA-256: 5e184ccbce9a6b34158099c6ccd79cef89c94af74cb67653d9c6822f24a103ca
font_02_sfnt_off0000b513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB513 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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