Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc8a6fc1a44055b…

MALICIOUS

PDF

44.9 KB Created: 2020-11-07 09:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 477ee786b2690c221f63df9944132664 SHA-1: 27815c5c4dbde40384d1640644836aa74c814b7c SHA-256: 0cc8a6fc1a44055bc2f5a75009a382f47bd7567caa9472c0bb28ef4dac764a1e
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. It uses an invoice-themed lure. 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?keyword=thomas+pacconi+jewelry+box PDF link annotation
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/mumufejak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5fa222671aa32.pdfIn PDF document text
    • https://forunevelaviwa.weebly.com/uploads/1/3/4/3/134392474/xoxalusakibisiguno.pdfIn PDF document text
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/lurazivupulezazaso.pdfIn PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/retuw.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/nivivojesezop.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/d266ca9c-92a9-40ab-9700-9f8da9d210c8/71662687174.pdfIn PDF document text
    • https://borivul.files.wordpress.com/2020/11/dilizimowuretakalobanif.pdfIn PDF document text
    • https://disabuwipe.files.wordpress.com/2020/11/48836793621.pdfIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://bomobaral.files.wordpress.com/2020/11/mivupojonozod.pdfIn PDF document text
    • https://nisowekewus.files.wordpress.com/2020/11/nursing_education_books_for_msc_nursing_free_download.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/5e_oath_of_the_ancients_paladin_build.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/rolovifor.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_off0000634b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634B 5308 bytes
SHA-256: 1f9c9b400ffb332c6b17f6745d790351f0d3abdf7ef8e40050d36f1e70abe757
font_01_sfnt_off00007530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7530 10516 bytes
SHA-256: 18d62db55deda9f5b9ef868b29378c5081320e05ed1fbff00b2062fb7526b081
font_02_sfnt_off000098f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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