Malicious PDF — malware analysis report

Static analysis result for SHA-256 5242a8a5ea04309d…

MALICIOUS

PDF

44.2 KB Created: 2020-11-07 23:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 693ecc472394d04e9b4d64021b5b737b SHA-1: 7652ffb78b4c6489ee39d495bcc828a4d68fc962 SHA-256: 5242a8a5ea04309d7829526525551a30ad0e7bb63046f94da2738834082a3e76
136 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?keyword=among+us+controls+for+keyboard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f8cc75942294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f88945ad83c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f8741a80be33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_5fa6566ebde02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fa23dde18815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_5f9b194020d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fa4966cc793b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c5cb7553-41bc-495e-abf7-9f8383930362/aws_certified_devops_engineer_-_professional_study_guide.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/25953209295.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6048 5472 bytes
SHA-256: ad74b807e5592ac458880e90ef14e0ca67153848d771bb6f385fb45eb8331bce
font_01_sfnt_off000072d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D6 10556 bytes
SHA-256: 188878267b5cc5ac8a9985c4bc469f7c6807aba3e38aa66c0da486e4fd35238f
font_02_sfnt_off00009640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9640 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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