Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c960a0e1714915…

MALICIOUS

PDF

71.8 KB Created: 2021-05-21 12:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aeaf07c0d48d7056d1f1b730fa2b16ab SHA-1: 99f882f907c2dd57f1dd1cc082b241fa93d3889a SHA-256: 73c960a0e1714915ccac0a279e3e535f205ca1e690750dd3e2772bc3d9030126
156 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 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://soxebez.ru/strik?utm_term=future+continuous+tense+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495841/normal_5fd61c3d6b19a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5fca25ebe0a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_60361dc364ef9.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/pumibazevek-kosobapi-gorupasajot-bokazibixes.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/1ab0744ccc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_604b50fb0cd42.pdfIn PDF document text
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/mufafubabaja_zamuvakake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_606df29d34608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5ff996f4a7e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_6059aa0fdc925.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494146/normal_5ff0bdce4afd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d3d1ab-183c-479c-818a-ffa2e0514e36/mikusinazekajaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/conditions_precedent_clause_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/how_to_use_gimp_for_sublimation.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/xuwugetusa.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/carneo_tivii_android_smart_tv_box_recenze.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/48790668372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9f0b1d-7b41-46f8-8ab0-007e2f52e3f6/79588094290.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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 5112 bytes
SHA-256: da3da538705815af12289b1e39d33c1d8a22ba135f0c9a059d95a8e740c3410d
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 10828 bytes
SHA-256: d47c6eeb92cb1055f020caf9fb1001764eea2ccbc8641b7814a82564d620fa28

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