Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ea7853388f0aa3…

MALICIOUS

PDF

43.5 KB Created: 2020-11-09 04:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 794871eab0691350ffed9aa58a02cba1 SHA-1: 9117fbeaaf2ef1b45bc7b570e79dd1cfa21238dd SHA-256: 39ea7853388f0aa36752ff5ff451fb514decef78f5b80f70e58b0e6332dc32de
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://traffine.ru/123?keyword=past+tense+spanish+conjugations PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445866/normal_5fa51551f3392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_5fa0f34d5aead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_5f9fba8da6ef7.pdfIn PDF document text
    • https://furutivox.weebly.com/uploads/1/3/4/3/134360368/zepoxexej_bikuwezaje_raroluw_keludet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5f97716decbc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5fa6c25605ac2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xizelaruj.files.wordpress.com/2020/11/65740351490.pdfIn PDF document text
    • https://zufibum.files.wordpress.com/2020/11/crowds_and_power_elias_canetti.pdfIn PDF document text
    • https://bagiwes.files.wordpress.com/2020/11/folaxonekodiko.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/rajozajilozaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/quickbooks_write_off_bad_debt_cash_basis.pdfIn PDF document text
    • https://sefudizod.files.wordpress.com/2020/11/wagapalaxutaf.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_off00006b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B31 5144 bytes
SHA-256: abfe437358ba4a057e44d1fbed6313f5d1df0f597f592681918e56d8457d5947
font_01_sfnt_off00007cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBF 11220 bytes
SHA-256: 2d0f4f8ee22aa674506c8246ef9716a3acef9afd972370abd0cd60351f457f7c

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