Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0ab1fdd513f80f…

MALICIOUS

PDF

83.1 KB Created: 2021-03-23 03:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c446316d48615a57a2b2a208c55690f6 SHA-1: b629ca31c0a0c77512781eb8a056d22ddcfa07e8 SHA-256: cb0ab1fdd513f80f9dff690c7ea8d2402a500929efd24f02297a07a0015a458a
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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.
  • 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://dugedepap.ru/wix?keyword=bill+nye+motion+quiz+answer+key+pdf PDF link annotation
    • http://vesajob.getenjoyment.net/xazegomapizorela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_602533e8a8edc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5fe240e7948af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_5fe96fd17fcac.pdfIn PDF document text
    • http://kompledom.com/niv_quest_study_bible_free_downloadhl568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_6016a50487654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_6021d7e5d8234.pdfIn PDF document text
    • http://catsism.com/jotul_f_100_reviewcp68b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_602a56d71f356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_6009a65906899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fec48ca025b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_600e67f4d37e2.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/wakivogejuzofepixeripixor.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/customary_unit_conversion_worksheet.pdfIn PDF document text
    • http://shothard.site/82183526770ftyol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_8264a56a05c9417b9beb1baeecef063b.pdf?index=trueIn PDF document text
    • http://buzanuziti.myartsonline.com/how_many_forms_are_there_in_wing_chun.pdfIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_ad993e51b2134bd792bd1b92c36474ed.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_685e11227e36454e9bde6d410a1bd87f.pdf?index=trueIn PDF document text
    • http://kipejefanowisu.atwebpages.com/sample_instructions_for_a_test.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_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 5668 bytes
SHA-256: 68dc9e286256994b0ff720e726010fb1b7fe4f790615bb8baa49980a9d7059f7
font_01_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 12624 bytes
SHA-256: ef8c6638ecf19978ca998d3a7e3585c206da38a7e65a5afd2d5177821f53556a

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