Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8623a88e6a5dedf…

MALICIOUS

PDF

85.1 KB Created: 2021-05-05 14:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 783578dcab502385c61f689d4ca1308d SHA-1: 54884ef474e9bd5b8c83a87e83816764bee81d1c SHA-256: d8623a88e6a5dedfa9b3a70d046466990239f7b3ea23855755da07e27091b8e7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to benign-looking documents but are likely part of a link farm to improve SEO for malicious sites. The primary malicious URL identified is https://kuzutuzo.ru/strik, which is flagged as unknown reputation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+set+up+intex+saltwater+system PDF link annotation
    • https://puvavijage.weebly.com/uploads/1/3/4/4/134461845/6032696.pdfIn PDF document text
    • https://raxokada.weebly.com/uploads/1/3/1/4/131409035/6100256.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/499e4d15a46.pdfIn PDF document text
    • https://noriledefokotox.weebly.com/uploads/1/3/0/7/130739853/xatejuz-fijiros-rofakiminime.pdfIn PDF document text
    • https://kedefakoriwo.weebly.com/uploads/1/3/1/1/131164231/265620.pdfIn PDF document text
    • https://wilalupesakugos.weebly.com/uploads/1/3/4/2/134235894/d062a1.pdfIn PDF document text
    • https://jogofevizu.weebly.com/uploads/1/3/4/3/134348232/sadipuvanovudukifom.pdfIn PDF document text
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/8925973.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/resabomibogodaw/gaurav_agarwal_ias_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/employee_compensation_policy_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021824c0-4deb-454b-bc8e-aab75ad05609/sc_child_care_emergency_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c26ee2-ab9e-4419-8e9d-9e429f8e19a3/difference_between_1nf_2nf_3nf_and_bcnf.pdfIn PDF document text
    • http://zelojagedalelo.epizy.com/google_chrome_extension_html_to.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/popusede.pdfIn PDF document text
    • http://pozijirume.rf.gd/value_added_services_in_logistics.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/82818060714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51dff9b3-6d6a-4acd-8c10-6504be52cc64/wewigovumaboxatixal.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/90494284321.pdfIn PDF document text
    • http://vafotuneg.rf.gd/latest_blouse_design_2018_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f231a71-11a2-400c-9c19-63d950fc6f5f/1645045872.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_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 5188 bytes
SHA-256: 9732304234754c9121cfc5bd8781b678cbdbf0b4900d744cc7747260ed1f1556
font_01_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 11204 bytes
SHA-256: 6bb84d6382485a2feaedf3f0e74696f8cb9d3a0a643bc43415c8681108878ddb

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