Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a1b2ef92a73508…

MALICIOUS

PDF

57.0 KB Created: 2021-03-24 10:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d8e6fb67e75157dac585d70237bb2650 SHA-1: 72fb8f94eb9c3a59c06d6d058122433ab8f19ed8 SHA-256: 45a1b2ef92a735082b60d54a1ede11ee64a772ebffdf0707365f10ac7fa8d6b7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.8258

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/award?keyword=eliseu+martins+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478703/normal_6040fc02b5be7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5fcbc5ce590c2.pdfIn PDF document text
    • https://wazalitewisoka.weebly.com/uploads/1/3/5/9/135960923/zupinowujona-fovunobufuxud-digokufixatiro-gakera.pdfIn PDF document text
    • https://ruwiderok.weebly.com/uploads/1/3/4/8/134891429/pokeje_lodadewuvopiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378830/normal_5fecc46f08d6e.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/448864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_60468df1879e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_605acca75bd70.pdfIn PDF document text
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/legelobofixomelamore.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/d305d51d8a6.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/puwaliverumido.pdfIn PDF document text
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/depebopibit.pdfIn PDF document text
    • https://vibofizetukoz.weebly.com/uploads/1/3/0/9/130969748/1210408.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/b51979de-15b2-48cb-8e14-dbffb6ec3957/97260892005.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_37df56deb83544d39be88e9290819757.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_443e8f00be7347ef811ac8b74fd677a1.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_af531b1d61034c259824f693ae2f9815.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad88d717-b5c1-4788-acb0-fc1a7397498c/q_dia_es_feriado_en_agosto_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0291db9-3cef-414c-b75d-09639d9c4852/how_to_turn_on_voice_search_in_google_chrome_in_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c86aab-b374-4e87-bcfa-648e7bac723b/16125922100.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 4916 bytes
SHA-256: 2746cb10badc711d828b2b812dd445e79383b9f1db49343080d465c540641f4f

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