Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5cdc0ce61c9365…

MALICIOUS

PDF

68.3 KB Created: 2021-02-26 14:29:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: bcf9d61619348e2d8e08c3a276c4fc64 SHA-1: 8629a2f1986b50e3341adcf8e3ed563c1fdadc00 SHA-256: cb5cdc0ce61c9365fc31edb1856458462aee59b64029b1ff7d1a99dcdadabe7d
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=dracula+bram+stoker+audiobook PDF link annotation
    • https://vonufire.weebly.com/uploads/1/3/4/5/134596457/nalegumuwuxozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_601cf85c296ac.pdfIn PDF document text
    • https://cdn.sqhk.co/nakolore/RheicXN/king_kong_kicks_hotel_shanghai.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421038/normal_5ffbde4a6b2c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5ff82ad31170b.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/82224194036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fc575bb9beb7.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/totumixivefiwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fc8c8d004128.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/jfgegd1/wood_cutter_machine_price.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/gheieha/ledese.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/gfwiINQ/12368388517.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/Z3idgcM/bbc_mundo_argentina.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/descargar_biblia_de_estudio_thompson_gratis_en_espaol_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_601b00f814a12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5ff16c4dee5c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fe01a362a1b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490534/normal_5fcd6543dee7d.pdfIn PDF document text
    • https://www.nulledzip.download/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasilew.epizy.com/acrobat_reader_offline.pdfIn PDF document text
    • http://pikizopesoru.rf.gd/1946322534.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_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 5288 bytes
SHA-256: 1bf1a73a7379c9c4ed10de43015f0b4c1ec01dfb1ed9707665da73852ba30bc7
font_01_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 10392 bytes
SHA-256: f1a528a311af4560da70dd8867fe28df5530b80805ec42cf539574d664fbc357

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