Malicious PDF — malware analysis report

Static analysis result for SHA-256 991c5b76ff332f0a…

MALICIOUS

PDF

46.8 KB Created: 2020-10-08 02:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 013ee42ed101570648c8bc9ce940efd3 SHA-1: 52682765512225c234804881f32a77c9f65f8762 SHA-256: 991c5b76ff332f0a10632fe1eaa83e5bad810b89306fb930655ad62c184e23bb
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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://gettraff.ru/strik?keyword=metodo+de+conservacion+ahumado+venta In PDF document text
    • http://zajozot.celiamai.com/uploads/1/3/1/6/131606346/guminisapi_pevozuzukalere.pdfIn PDF document text
    • http://mujomum.r2mechanicalinc.com/uploads/1/3/0/7/130775654/timeravulum_rilosod.pdfIn PDF document text
    • http://files.writinginkc.com/uploads/1/3/1/4/131438539/8b80b4565ecf095.pdfIn PDF document text
    • http://files.midwayusancrs.org/uploads/1/3/1/4/131438216/xeduxizexug.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://cdn.shopify.com/s/files/1/0484/0551/2349/files/michelle_vasquez_brian_phillipson_sacramento_county.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3052/7131/files/rosario_de_maria_rosa_mistica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9682/8832/files/caracteristicas_de_un_algoritmo_definido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/tugijagexalujopazokadube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c42d48-c928-4948-984a-9ad7ccd2c721/dawukemilagagirezokiduvug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0634/0515/files/vezunurav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9418/4607/files/william_hawkins_art.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/parts_of_similar_triangles_worksheet_7-5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7827/8563/files/pie_jesu_lyrics_charlotte_church.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6775/2100/files/dudizewuvanuxusagokadibil.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6799 5092 bytes
SHA-256: b17c9c1280057d8be84ee8d06b9b1280e09065fb105ead3493745df4502f2d3c
font_01_sfnt_off000078c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C3 11712 bytes
SHA-256: 1f2d32b6d942642360209070922f19c3fda57ea2a3ddfd9fffcaefc1cd6da1a8
font_02_sfnt_off00009ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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