Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95f8c2c3d1cecb8…

MALICIOUS

PDF

56.1 KB Created: 2020-11-06 22:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 47851110409e79826290d06183b170dd SHA-1: 39e2d79f5bc845c9ab8a0e0319a6dc2797ed928b SHA-256: f95f8c2c3d1cecb8e2d03afb4fa012b9b231d68feec7a6c4153b1751c90a450c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with one prominent malicious URL identified. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links, including a suspicious one, suggests an attempt to direct users to potentially harmful content or exploit a vulnerability through a linked resource.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffnew.ru/123?keyword=2005+f150+p1299 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f87b4767c4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_5fa06fd6a44af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5fa056587708c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_5f8e05ddcd218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_5f95b095b8f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f874de854544.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/24e25ee6-879a-46ca-8db8-149e1706d073/xifunomeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ab985d-9353-4f47-8abb-dc99487b09c4/contemporary_abstract_algebra_9th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637232ee-c828-4cd3-a3d5-68699ae979e0/code_of_conduct_of_the_samurai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5be5659-5252-463a-9351-691870a09840/sony_wega_tv_36_inch_weight.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://pifakimep.files.wordpress.com/2020/11/fododuxuxinoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f70ebc46-7eda-422d-bf99-8165bd5c4d2d/tudosaxuzapasatolugarapa.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_off00009e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E55 4892 bytes
SHA-256: 2d0d50c0bf0d1073ba7226ba8295ef690c4fa1d7647d328be6e9ff734b80388b
font_01_sfnt_off0000af26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF26 10948 bytes
SHA-256: e73c9fccfef3133e403a1f0e2cba6998eaf062247b4aba3f4d6dcf8126139e20

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