Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82a71ff9f128f36…

MALICIOUS

PDF

81.0 KB Created: 2020-12-21 09:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d09cc61f50356bd29f59e5eb451cad1b SHA-1: b847b0ca977771b7fbff468d4147d42ebc9e7e35 SHA-256: a82a71ff9f128f36289a6156b446b92f5076cc445a338f81406dcd0910e4acea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of embedded URLs and a high ML classifier score further support malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or content distribution vector.

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://traffine.ru/strik?utm_term=final+fantasy+ivalice+map PDF link annotation
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/talawabebid.pdfIn PDF document text
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/podigoremekapaf.pdfIn PDF document text
    • https://gefumugizifoz.weebly.com/uploads/1/3/0/7/130739155/7173463.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/ef7a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc288e412facd59ceb74ceb/t/5fc9c711196a600d3c31e434/1607059217845/rered.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93869b84-dfbe-4ce1-aed4-45d8b4edf4aa/mabikapexazimu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcec46b89e267495de7238a/t/5fd6e449154d727871ff6198/1607918665854/blank_bar_graph_sheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79c85e71df64d6bd9c29/t/5fdcc3ba53796104502ca1f9/1608303547155/rebiwidaj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5be7c27a199023ad675ed/t/5fce2c498a55f2188ba11ee1/1607347273965/crazy_cell_phone_guys_shirley_ny.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc174e7bf71053ccb141a2b/t/5fcd24789aa2de0c649bb05d/1607279736508/tegelugaziwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f884fa4-e7cc-4e5f-b781-1815c4e6b0fa/samurai_champloo_episode_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d180077-5a0c-4944-860f-cae5e6b88511/power_wagon_for_sale_san_antonio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 3780 bytes
SHA-256: 9712c242dc14d8490fabfc27fceb75313995ddc1cc91e079996088fd3111e541
font_01_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 5180 bytes
SHA-256: 077968cabdba72c1f5daf9aac5c5f7a81e262a38a1baf237567c0750318733aa
font_02_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 10804 bytes
SHA-256: a65b0b0f2a4063aac0bf3c512d9ff9b7fe6e7265a94a7b3072d23b2656b370c0

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