Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dc570aef5d0609…

MALICIOUS

PDF

75.7 KB Created: 2021-03-02 23:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 593b97f008c9040282f5b19bd74517de SHA-1: 96991cf5045b78f615d3a1840c987d2cee4695e9 SHA-256: a4dc570aef5d06093a44a6d98e31481856e007f6eac185e034e2b4c810871049
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=fallout+4+mods+not+working+xbox+one+2020 PDF link annotation
    • http://sutovuresas.mygamesonline.org/vituwifowegenituvopibobir.pdfIn PDF document text
    • https://fepazizagi.weebly.com/uploads/1/3/5/3/135345318/gofeni_jiradawozuzo_sajax_xugozixasot.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/44072441718.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/viruko.pdfIn PDF document text
    • http://jusapp.club/android_studio_ubuntu_16._04kdjw5.pdfIn PDF document text
    • https://gudivolopuna.weebly.com/uploads/1/3/5/3/135346868/kivajeka-vefewon-kosez.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/19fce2f.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/bagaxonijumeva.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/gi1gjYK/zukutup.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/846736.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/rupatojuko/samsung_a800i_firmware_free.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/51145498462.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/79512157063.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/86442057649.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/17999861710.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_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 5828 bytes
SHA-256: 50c2715d4c940e5ba61c36a86ff2e02c1bd29f5e3169e8724e6a2bced713bef6
font_01_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 10208 bytes
SHA-256: 60f7e985e264d2fd6d63d1d93b3c00a9d7bc8851e64ef2147b54a5e53c6019d1