Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de5938d991e0609…

MALICIOUS

PDF

41.3 KB Created: 2020-10-10 03:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 52a7f5909dd6b80b8dcc57a08ae413d4 SHA-1: 19a3577042e6304829f69deb40cff08ebe1db53e SHA-256: 4de5938d991e060931912d1bfdef69dd29759bf0b578e488c55f9de69515349d
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=formulacion+y+evaluacion+de+proyectos+temario In PDF document text
    • http://files.isiscommunitytheatre.com/uploads/1/3/1/4/131455463/zukuwezov.pdfIn PDF document text
    • http://gakopu.crossroads-vet.com/uploads/1/3/0/8/130874422/tanegox.pdfIn PDF document text
    • http://files.avilachildcarecenter.com/uploads/1/3/1/4/131407687/tajugeresenumi.pdfIn PDF document text
    • http://vakupa.phillip-adamo.com/uploads/1/3/1/6/131606617/4a7258d4f073ce5.pdfIn PDF document text
    • http://files.motherlodemusicalmarin.org/uploads/1/3/0/7/130775907/4765563.pdfIn PDF document text
    • http://files.stpaulsbrookville.org/uploads/1/3/2/8/132815742/wenorukusana_lizasipamazi_rularoganofuv_xolorogukozine.pdfIn PDF document text
    • http://debafoj.chenweimeng.com/uploads/1/3/1/3/131380600/jeduw_getezogabapa_xepotegezex.pdfIn PDF document text
    • http://xikas.numanagement.net/uploads/1/3/2/6/132682883/58d1e676d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0528/files/guzatixekoponinaves.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/52351193849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2469/7509/files/adding_and_subtracting_rational_numbers_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6667/7665/files/jilom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0386/1401/files/ley_de_control_de_acceso_de_1987.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_off00006042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6042 5336 bytes
SHA-256: ec3c1a68c7272d7c1c6c962ebe977ebd3d171ebb62099cd714f80874bb3a1bdb
font_01_sfnt_off00007261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7261 11088 bytes
SHA-256: c8d6c1008cba2da7725335908aeb83a3053c4174682ae56da8695574e308e70d