Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f4f3daf4057cb0…

MALICIOUS

PDF

45.4 KB Created: 2020-11-06 02:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f1f388b45a6f3b532422b5464da224ca SHA-1: da7f6c4437e78dee3e5cdc2d3548ed5a4f06ecda SHA-256: f0f4f3daf4057cb075d955436caf705755c753b619e68b82aea97cbf3a84f545
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://traffking.ru/123?keyword=norton+guide+to+writing+pdf PDF link annotation
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/vutuvijuvopevizife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f8ccb4e8cb34.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/5639183.pdfIn PDF document text
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/sinugegano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f918fdf083f1.pdfIn PDF document text
    • https://zowutopukanujim.weebly.com/uploads/1/3/4/2/134235103/xewajunimojikun-xomewakipeju-relet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5fa2e1109090f.pdfIn PDF document text
    • https://tidovikazixuwuj.weebly.com/uploads/1/3/4/3/134316919/65a050b9e0d034.pdfIn PDF document text
    • https://zaxavafu.weebly.com/uploads/1/3/4/3/134323176/bamuve_savadapomurojo_zovazazenifeli.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/vamatebumaviwaxowenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_5f9d6fb938701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5f94d620be372.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/arterial_blood_supply_to_brain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedc8847-759a-4b58-be2a-0d3343815379/ho_bieu_chanh_truyen_dai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcec56cb-01fa-4c99-b560-f425ab6d76d4/roland_pma-5_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/ratud.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/schwerbehindertenausweis_antrag_rlp.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000749c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x749C 4852 bytes
SHA-256: 730f6071b27f493d588147dad50638e92ce9e64a0c39cb08b3cfa804d0e128ae
font_01_sfnt_off0000854c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x854C 10300 bytes
SHA-256: 1643c7f3314ca3b664af09ef074a444ca7143ac5521a441d06544ce737b47ca7

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