Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b91a04417f4b77…

MALICIOUS

PDF

65.8 KB Created: 2020-11-07 18:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5ef1501554c10b29c0d02c1627ece889 SHA-1: 2ae0e76f1253875e2fcc97345531ea83b22335c8 SHA-256: 87b91a04417f4b77a98580b784187dbcf57f91abfc97fa1667fbfa024d1ed339
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://traffset.ru/123?keyword=coptic+english+bible+pdf PDF link annotation
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/2fb1c1cf7e39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8b738f7247a.pdfIn PDF document text
    • https://vadulovoke.weebly.com/uploads/1/3/4/3/134338980/4854558.pdfIn PDF document text
    • https://zemaxixose.weebly.com/uploads/1/3/4/6/134636511/4396223.pdfIn PDF document text
    • https://tafopolen.weebly.com/uploads/1/3/4/3/134396822/dixepipokewegu.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/dibuteloda.pdfIn PDF document text
    • https://sefufomoxuve.weebly.com/uploads/1/3/4/5/134528328/6e2b58285f8f.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/mipagililokiziz-fojuw-goladud-miposi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://kolinaxud.files.wordpress.com/2020/11/94126927529.pdfIn PDF document text
    • https://bozuzukisiz.files.wordpress.com/2020/11/43041282020.pdfIn PDF document text
    • https://kilenija.files.wordpress.com/2020/11/zunutikerujaz.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000993d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993D 10988 bytes
SHA-256: cc77e23abe1fa43cd96627e75631a1a32f9819f91225b1278561a07a010b4410
font_01_sfnt_off0000b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70D 5156 bytes
SHA-256: 062abc4f9d75c42eab93d9f00fd385c3262677f19b70ca918adac23167e30595
font_02_sfnt_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 15424 bytes
SHA-256: 6d38868779437695d38041a0be9826a96791fe8baa7169ed9520d2b8ae427de5

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