Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b9c0a3674e29ef…

MALICIOUS

PDF

42.5 KB Created: 2020-11-05 19:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 64e51fd77f20d3538f0eb81c375dd5e5 SHA-1: d8f44abbdb1215eb06785443ad7ce44cbc25c1dc SHA-256: 36b9c0a3674e29ef9813e0ca22982e323218dbb2c6a8ce7b76716ed1af1ff791
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=map+of+union+states+versus+confederate+states PDF link annotation
    • https://tatazazotogowe.weebly.com/uploads/1/3/4/6/134618267/5cc117b85a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5f9d35de15bac.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/2d1fe7f4.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/pafiruvolipa.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/ad9d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5fa222d73ea72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_5f95aba5eb874.pdfIn PDF document text
    • https://rebolotor.weebly.com/uploads/1/3/4/3/134364816/nodovexeguja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3110ab82-a556-46cc-9d22-fe221243277a/wawisapozipikedulutadofis.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/jesunukikusux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adca918f-66e6-49d3-b34b-573583b4be33/watch_z_nation_season_1_episode_1.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/barron_s_sat_2018_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/tafiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01403d53-8f17-4dd3-9394-18ab8a501784/villain_bengali_movie_hd.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_off00006547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6547 5184 bytes
SHA-256: 98b097fe6594a112d00a3a940f001e48d34a49666ebecba19d048d59aecc148e
font_01_sfnt_off00007712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7712 10924 bytes
SHA-256: 34ce69b8131b3817988b6c3055bca1fdf351174cf4f6c9ea8b61e97ed97cb136

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