Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91b07883e11913b…

MALICIOUS

PDF

73.6 KB Created: 2020-11-10 19:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8ae55d5fbd2496e6acec4f410d2597cc SHA-1: 9117f8a67e9ac20aec61225f2629471ec0433a1b SHA-256: c91b07883e11913b40b322547853a29df9f369d155d5c9fdfff56a8110ca6bba
126 Risk Score

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 0.9998

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://traffking.ru/aws?keyword=smile+book+online+read PDF link annotation
    • https://poxanopa.weebly.com/uploads/1/3/4/3/134380657/3641668b05c2375.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tifuxasorelav-sunagutigu-gikisifexixabot.pdfIn PDF document text
    • https://dotitikedobe.weebly.com/uploads/1/3/4/4/134493035/59e588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f87dc91904c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_5f94b01146e6f.pdfIn PDF document text
    • https://jadekida.weebly.com/uploads/1/3/4/3/134349878/00b7f70787.pdfIn PDF document text
    • https://xizilajonufu.weebly.com/uploads/1/3/4/5/134528384/e8ad9.pdfIn PDF document text
    • https://paripipedaninez.weebly.com/uploads/1/3/4/4/134444050/b56c6504dd2.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/devamet-derekaw.pdfIn PDF document text
    • https://rosiwefoves.weebly.com/uploads/1/3/4/0/134018148/gesomoxez_nesurimosewafal_rinuluwojej.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/tudawufed/share_market_basics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae57eb83-d56d-4390-bc46-45eab8924cff/wetunaka.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/genasi_dnd_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07238d97-d67c-4676-8bbd-607f14371ef0/sheet_music_book_fallout_3.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_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 4808 bytes
SHA-256: cc6053c9972155c5c20ee7f12f0840708b1293c5df5cd59f21176a572881ca03
font_01_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 10368 bytes
SHA-256: 956d64ffdc18b1c7224adfaa40f776aff14e4cfa936d216d065d1da9eefdf498
font_02_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f