Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcce2260eaba367…

MALICIOUS

PDF

82.9 KB Created: 2020-12-26 05:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c07965bfc831241b55712ab2692e6581 SHA-1: 7dadd0ccf42c23c86aba6637bba0369028910a75 SHA-256: 7dcce2260eaba3677c7a4a39326452911bde2e6d552cefbe8d103e544c78cbe4
214 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/123?utm_term=cellular+respiration+an+overview+pogil+packet+answer+key In PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/sowetoriku.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/jYLhfjg/1868589978.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/hhfW1if/wevukanedutavivuxuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buwosevax/general_ability_test_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/castle_of_glass.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/zagaduxefezu.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/bootstrap_form_input_focus_color.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/17449431946.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/77164632278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0589f793-8e18-4d0f-b4f5-48afbf2169de/dadapojolekoguvezunuxexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30a8e83-675e-4ac0-a99f-95f5fa4d1e31/google_translator_english.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 7560 bytes
SHA-256: cc3d2d1cfde94cf6336d3bff33ac36eadded2386e977bcfbf9db687f618982dc
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 5324 bytes
SHA-256: f25e2fdd53a932ec6935285f7e10d664a5bd0a08838341f6a48dc553a22c470c
font_02_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 11252 bytes
SHA-256: 250abd1a1d56925463151e120229a9caf014051e8f894662846fccfe69cb24da
font_03_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 16216 bytes
SHA-256: 5cb4188777f33cd410073f8b9d14bcb5a62f3956273c75e1cc66e568e6902af1

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