Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b997fec4b879fa4…

MALICIOUS

PDF

73.1 KB Created: 2020-11-25 09:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2f26b638feec2af4f331f4ca70805837 SHA-1: d23911cd5785befad44a9fa38c4a69d16ac33f50 SHA-256: 9b997fec4b879fa42489eaaee1c3b832bd08e3159c0b445fbb4b302af54d9b04
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9995

Heuristics 4

  • 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.
  • 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://trafficel.ru/123?utm_term=good+morning+friday+images+funny PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409411/normal_5f9ab711a732c.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/wenas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5f8960d9b9eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_5fbd9d9107bee.pdfIn PDF document text
    • https://nelabudojila.weebly.com/uploads/1/3/4/6/134666505/jumap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473926/normal_5fb2b619ce0a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f8cbcd040463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5fb2e85558213.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/fifomi/solidworks_electrical_black_book.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/22878618838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996add3a-a5ec-452e-a609-8e8172ca0ee7/stevie_nicks_i_can_t_wait.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC148 5328 bytes
SHA-256: 33e8ef5f63ff525c42aba2a3be62b92107e1df5d5f6f4a9d948d7b6adb1c964d
font_01_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 1852 bytes
SHA-256: 30d16f7417f0add8d0285b648bbaf00e913f8a8b98029eef0ba4a775d80cd2e5
font_02_sfnt_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 10300 bytes
SHA-256: 1e8e606e945cb77de0fff59f02e2fd7f76aeb2bad068e7cc7cc17f00727a122c
font_03_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: d7d555f50da2abfc6798c37702ee236250a6b46c7f5be4aefc870f7c5eaafe30

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