Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c71c66d91a0686…

MALICIOUS

PDF

75.1 KB Created: 2020-11-28 15:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 21c4b26cc6450771e3a2ed5379305464 SHA-1: 95d3e7dcceb898800808e4ceddd4a965a54442af SHA-256: 18c71c66d91a0686d3ef447cde1ec9eae4a301008055008f5ff8ce436b8cab84
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-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=black+diamond+revolt+headlamp+battery+life PDF link annotation
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/xujutopumesob.pdfIn PDF document text
    • https://zudamuberul.weebly.com/uploads/1/3/4/8/134854759/2e1d9d7eefe8de3.pdfIn PDF document text
    • https://taneromujek.weebly.com/uploads/1/3/4/6/134611199/02fc7761fe.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/tadovu/planos_arquitectonicos_de_casas_con_medidas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f61834-cd68-4262-b03f-98b9bbfb7e79/muvofopusadovi.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/bypass_mega_limit_without_vpn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f7607d-79bf-4739-b2da-cfe3a7b5b787/69284626603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6baea40b-9da8-47fa-b882-cd70a180b393/bemavoguje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fc32ea-fb37-4445-bc16-a1c256aa9fb9/vawebetijafaduwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0cc146-0b31-4f6d-95f1-08c9a0987cca/68690947444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e475f5-7e9c-45d5-9ae7-8908817b80f6/empire_of_the_sun_alive.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/samsung_repair_manual_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/fokufo.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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5632 bytes
SHA-256: 63405140644c1d422d42855f867eed7e27b3acad7e5e4a7d2014c4ebae354092
font_01_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 10624 bytes
SHA-256: 44f8c4908ed1606c536262f724a13418e2673dffe03c253ee1f5a5bf8ff6bc1e

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