Malicious PDF — malware analysis report

Static analysis result for SHA-256 5940c2f8369c99cb…

MALICIOUS

PDF

72.9 KB Created: 2021-02-18 16:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 33fbf58e1250f8b8a7cf4b7ebe40f60f SHA-1: b2b4326d5e86289f676d2f4ef89f9abd4dfe7923 SHA-256: 5940c2f8369c99cb12729373fc53f37c7a2dfdfb84bdf21a41ffefb0b62c1ccf
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external resources, masquerading as a document about "Our town act 2 questions and answers". The primary link redirects to a malicious SEO link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect the user to malicious infrastructure.

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
  • 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://crophysi.ru/wix?keyword=our+town+act+2+questions+and+answers In PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/2547391.pdfIn PDF document text
    • https://cdn.sqhk.co/sujutowupolu/cDicjfx/the_last_stand_left_4_dead_lore.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/dazokubuk.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/fifq9Lt/31431015496.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/p34Igib/personal_fitness_training_certification_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_6005d690bbace.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/6486889.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5fe261ff4028f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5fef3c767e0a2.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/3035087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_6016826f9e590.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/bejexe/jukek.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/division_practice_worksheets_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/electrical_contractor_company_profile_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/samawofol.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/45032676601.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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 5280 bytes
SHA-256: 024c3e437fbfe858d58359615f48ad3e4732ad39b26a4dab00c623664de85fc1
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 10128 bytes
SHA-256: 597b06dbb955ccb9e2e05ccb1b36d2ba8b3e8d09969450a5995e7e4c43638ebc

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