Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f8dca91f498ed0…

MALICIOUS

PDF

38.7 KB Created: 2020-11-09 14:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: c40e16ead03899fa7b21860f96b055fe SHA-1: bc792d582eae499d148030409c009f073cb5ad45 SHA-256: a5f8dca91f498ed0028ff3cc7dfc002fb49eb924964fd3d94f3bba1e7b378eca
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?keyword=manual+soundbar+sony+ht+ct370 In PDF document text
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/5263533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5fa76a8776c30.pdfIn PDF document text
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/863671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f870c3990d2f.pdfIn PDF document text
    • https://wilixutisew.weebly.com/uploads/1/3/4/0/134095986/9085615.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/3581a8d9-93f1-4c76-936e-9f2f5b43f647/23526248134.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/xodelekapazibezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df6ec85-1a79-48a7-b10d-0aea872d8933/abdullah_jahangir_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2894890c-87ee-4718-9080-d232e340b315/16060960579.pdfIn PDF document text
    • https://s3.amazonaws.com/mazugezijap/unblocked_games_boxing_live_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831317cd-69e4-4026-b05d-0094143dd801/75959443602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f24ff18-4e43-495d-8223-df3778a22cd6/dupos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d03e20-832a-4fdd-a288-db5175aa2296/wobikukezubufekizarezud.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
stream_003_off0000523d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x523D 5660 bytes
SHA-256: 36fb13c2c9c811969cfb856d0111749dd2850a04eab97b660b8bf6a0e647d558
font_01_sfnt_off0000658b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 11652 bytes
SHA-256: 055373f338ce06042abbf052926e402e345b9082c41ee77311675a65aff1ffd2