Malicious PDF — malware analysis report

Static analysis result for SHA-256 f359525bb1bc4b80…

MALICIOUS

PDF

44.8 KB Created: 2020-11-09 14:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 30a12446011bd8acc8e6ba3f65725773 SHA-1: 2e09509e1338eff1bc25846759b8722efa524490 SHA-256: f359525bb1bc4b807ae79865cd64fb931fa7299c85b455c1b78ba79b43f836a9
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 and presents a deceptive download button. 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=download+kodi+18.1+apk PDF link annotation
    • https://luzejezoroze.weebly.com/uploads/1/3/4/3/134361740/lubeninusukasinosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5fa28242cc4db.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/monobasu-lesapulez-wogub.pdfIn PDF document text
    • https://kupejofep.weebly.com/uploads/1/3/4/5/134589233/piguxasi-sokisusabupu-nogum-razedejerata.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/noxitogixuxinopinop.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/309b3.pdfIn PDF document text
    • https://weduzoviduluwiz.weebly.com/uploads/1/3/4/3/134385862/b5d6a76a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8dfbc4d7c27.pdfIn PDF document text
    • https://mebogizudoredo.weebly.com/uploads/1/3/4/4/134472702/167df6.pdfIn PDF document text
    • https://mejebogisoxofix.weebly.com/uploads/1/3/4/6/134606558/9508619.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/wulagisi/isomerism_notes_for_neet.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/angielski_czasy_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005e793e-df04-4b55-bbd0-446cfa45036b/soulcraft_hack_apk_unlimited_gold_and_souls.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_off0000640e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640E 4700 bytes
SHA-256: 15ef81348fca7f7edae65ce6dce9bdb3d776b7bd2770c220c4bc9e353808a107
font_01_sfnt_off00007420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7420 10776 bytes
SHA-256: 13dbf1c53fb864ceda8c17fb4c2b03e4499b99f80b4510287409218d15b8a840
font_02_sfnt_off000098d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98D1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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