Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3364c9023417882…

MALICIOUS

PDF

75.3 KB Created: 2021-03-11 11:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2050b38fbf2eae8570210cd0939375a8 SHA-1: 5c71f67e8fc9164cafeb3e42656b7616c5515b5d SHA-256: d3364c9023417882dd98cf239f8d5b52e0f898afe465a048e576c4cf794a1b10
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jumiwimov.ru/award?keyword=biology+practical+book+class+12+cbse+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448545/normal_5fdbc20a6e09a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_603aeefb9404d.pdfIn PDF document text
    • http://nuromagav.iblogger.org/prokaryotic_and_eukaryotic_cells_venn_diagram_worksheet_answer_key.pdfIn PDF document text
    • http://zosexurotatogek.iblogger.org/80731879123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393363/normal_5fed457851fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379487/normal_5fdf1448f244b.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/8189497479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6017042b7f36b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472200/normal_5ff06ed2b4921.pdfIn PDF document text
    • http://kulokozataxat.22web.org/gezopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_600d6fdae2fe6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobuzazan.rf.gd/regabezajafebuzudurameba.pdfIn PDF document text
    • http://figupowogo.rf.gd/pipusodu.pdfIn PDF document text
    • http://mogopubu.epizy.com/65040668595.pdfIn PDF document text
    • http://ninanupazazudad.rf.gd/free_printable_column_sheet.pdfIn PDF document text
    • http://mujigakevomo.epizy.com/aluth_adara_wadan.pdfIn PDF document text
    • http://zatupux.rf.gd/lanedopame.pdfIn PDF document text
    • http://naburonip.myartsonline.com/does_the_bowflex_blaze_folded_up.pdfIn PDF document text
    • http://wewodis.rf.gd/70663698322.pdfIn PDF document text
    • http://ledojoburug.rf.gd/the_open_window_by_saki.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 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 5864 bytes
SHA-256: becad089a3250f48b1bd5c86ee238f5c8c24446d8a65a8bcb5265069365dac61
font_01_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 10424 bytes
SHA-256: 961af1793ed14278e48112e4ac346851bb2ae38dd971e10a1d1ff823c7ffb95e

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