Malicious PDF — malware analysis report

Static analysis result for SHA-256 790de67ec47289d0…

MALICIOUS

PDF

72.2 KB Created: 2021-02-27 17:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 40d4833c1c6f49aa31e499c434a2907d SHA-1: 30ed6c875eaaf737b5580907ecfdf68d2a5282cc SHA-256: 790de67ec47289d0344c2da21825d435b3b221a80e3cb22725cc65111a0ed690
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wb?keyword=comfort%20aire%20dehumidifier%20bhd-501-g%20manual PDF link annotation
    • https://cdn.sqhk.co/jigitovewuk/HHoQxgg/79043488111.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/jgYiief/netopumukalovegofo.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/IihZWha/38689341070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_6019574816c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_602be9fe5c7e6.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/jTTjdym/82461072269.pdfIn PDF document text
    • https://tisawisapapaw.weebly.com/uploads/1/3/5/3/135326074/6572955.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/7031438.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidazi/XNSthA9/97033329335.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/Mghbn3u/95721271070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_6038e30a109d4.pdfIn PDF document text
    • https://pijetupuz.weebly.com/uploads/1/3/4/3/134351396/c41a3675ea01.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/roxawo/bootstrap_form_group_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/used_cheer_uniforms_for_sale.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/what_does_william_afton_look_like.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_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 5540 bytes
SHA-256: ca776dd3568befa203f5893566de2ee7e0d5dfe4e8ace8da859b787e1ca0b14c
font_01_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 15072 bytes
SHA-256: f7cf9c295c7f3d7a2d6b1908ab0494230e6547b847f1c1965a7032d97f9c9631