Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b058aef99dab8a…

MALICIOUS

PDF

48.2 KB Created: 2020-11-05 17:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: ad1bb8dcd8e362ee8038fe6b16081df2 SHA-1: a0ee217888a0e97924d65c6f6f06b43f1d32fd7d SHA-256: 42b058aef99dab8a07f08a8d328dc769ce3cf192877f3ca279a65e452e026d8a
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://trafffi.ru/aws?keyword=chapter+6+section+6.1+ionic+bonding+answers PDF link annotation
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/lurituz_dugasadan_vilogolakebik.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://s3.amazonaws.com/tofizo/citroen_c3_2005_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7686b9be-1801-4431-8bbb-94c81bbb0c46/34494620109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d03cb0-accd-410d-97f8-852152ca5dd7/ana_luz_rodriguez-paz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a9014e-7b2b-4c14-91d0-25d800b7eeea/15000779075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1682ad8-8bce-4724-a494-1595b9504d6e/xufajeteribivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dca9007-bdcf-4ab9-85ee-f03f9a26d4de/tipo_de_computadoras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c99edf-ab3c-4502-9a51-eee0ca9524ae/zizilum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb32458-5cac-48d8-ba13-0ea49e371ceb/31294509414.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/43264370825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494e82fd-2e15-4b47-b2e7-2d821b5ce297/virtual_assistant_resume_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/direwabetebamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df868237-8586-4558-915f-bec1935d7040/tawasanewaxodatewetotiw.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/65257791668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44c8f63-98f1-4114-91a1-3e4bfb0f87a6/99755036426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8115ce-bcbe-40b6-be7b-98a07cec6b47/vuroli.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_off00006d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D66 5584 bytes
SHA-256: b771e65cca834f07750001acaf02c0d958e9b60f5c16edfe851371ac78691508
font_01_sfnt_off0000807c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x807C 10816 bytes
SHA-256: 497a3cfb277ad2d42e1cc74d7a9d0fc92c8d770174383bd31ffff710e053eb5b
font_02_sfnt_off0000a563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA563 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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