Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd8543d04bd2485…

MALICIOUS

PDF

41.1 KB Created: 2020-11-05 19:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 37620815e68dbf7368ea94bc0331f14a SHA-1: 4bfcf860b7e41df83297cb9f77357d6905082a2f SHA-256: fbd8543d04bd24852f2423fc1fb6a2c35eee8c44090b3ee09083d48017ca675e
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=how+to+change+the+snapchat+notification+sound PDF link annotation
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/297c0.pdfIn PDF document text
    • https://faxosuxen.weebly.com/uploads/1/3/4/3/134342902/e90e9c3ec4c3209.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/latelojoj_jivifijev.pdfIn PDF document text
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/bavelizekojupazujofu.pdfIn PDF document text
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/2817729.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/c25ee64c-6711-4096-8f64-61e315779e8d/86594797469.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/xasanopivabodusosajuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9019790-6107-44e3-be67-58eb80835528/kiniginesub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08720dcf-9dbf-4483-b0f4-cab2c813e9a4/39981929000.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/21_cfr_part_11_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/income_tax_changes_for_ay_2019-_20.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/transformation_of_parent_functions_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/livixikutiwifas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebcb6a04-ba22-49ca-8a9e-34c921ed396c/62836253576.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/harley_davidson_sunglasses_pink.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_off000061c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C2 5340 bytes
SHA-256: 71e62993dc0b941e20b1ef1db17043f951041026c0aa1920409d68482dee0c28
font_01_sfnt_off00007408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7408 10464 bytes
SHA-256: 225fdbc93978d0466657c3ff557afade12186ab5d7f82ab554bb2581ff406d84