Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39706134eb728bb…

MALICIOUS

PDF

40.9 KB Created: 2020-11-06 12:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 7e43b7835096952a83c8699082d5e284 SHA-1: 17e81165bb4b72492f452f5104b2631f6e615634 SHA-256: b39706134eb728bb3d137d0c0b3dbb08640837b155c12f46ef607b6a3d70e2f1
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/123?keyword=eastway+middle+school+fights PDF link annotation
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/rolifavoma_lawafaledalil_porugijafer_vevujozikevox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_5fa0ff3b1ee08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f8eb5c45a84a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5f9190d425c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5f91616cd4563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5f9e3f4cee709.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/85632959-af5e-4748-a008-94a344bbc1cb/3218489360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136dfcf2-de55-444e-9680-fe11e8ff794d/88768493762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e4f917-1eb2-4d93-88c8-e0ad421f1d8f/vezurikenapiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae5ca92-8f15-4fbb-8d56-8f4e4402c468/64908978740.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/3184718272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4f11cf-6a87-478a-8a96-9663847d2c31/jivuzubedopujadipavewatum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b69b0e0-7cf6-4d67-a7e3-ec051e9890fd/suwenuvepujawod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b08082-bbe1-4afc-add4-a2421a80f6b4/27160590343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078ad674-47ac-4717-92c4-a6d06985a3c1/sivebebogutuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/63097763571.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_off00006242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6242 5488 bytes
SHA-256: b0ad48322fb5495d34fc6d2ff6070bf3c21c132569d511e889d54dc0db2cfe0d
font_01_sfnt_off000074eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74EB 9964 bytes
SHA-256: 59396f3a16a8ebd76d2c16e662287fbc3f3bc80392d1690215858be9a154c657

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