Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6f990ba7d4f34c…

MALICIOUS

PDF

65.2 KB Created: 2020-12-16 03:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 97d245a97058ecf8638c6a2d0ce2910f SHA-1: 1525d0cdc5eb76956a6050479f95aa9e5845f884 SHA-256: 4a6f990ba7d4f34cd833c7a617ef2945c683f18bceb033ccd72a4d4eb7f7b055
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=am+pm+worksheet+year+3 PDF link annotation
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/felolafikebas_xagetuvegile_rifebibisim_pivobude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f86f9faefe36.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/5858082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/697ec5de-0ff5-4555-9c47-68d69e3f3a4c/93223537012.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0012c12facd59cea80d2a/t/5fc10abf4f983757200484e3/1606486719992/33963743983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a1d1e1-3f71-4286-9f2d-0b98aea92126/toyota_v8_manual_transmission.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59da3bf71053ccb2fc112/t/5fcc387b0ab5d62febe4b0d5/1607219324036/50980298090.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0ee44f98375720a7d295/1606291173601/1956611921.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9fec917750a3d7b949/t/5fc30f649b1ed0353841a331/1606618981872/examen_del_capitulo_5_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/neribi.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/97586566439.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_off0000b5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E4 5072 bytes
SHA-256: 45c76b974d4a9a4220156d6167a2b66dd0828232b8b5d885b51fe5190928da7e
font_01_sfnt_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 10292 bytes
SHA-256: 273b9973012501311c99392f5491162d58edf98cad21406e241527d4f77553c7
font_02_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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