Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace282c6225c49d4…

MALICIOUS

PDF

73.0 KB Created: 2021-06-12 19:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73830868aa78f405f49d1379e5977c0 SHA-1: d22e47d667810cc7e228c429fa715b3964f7d4d2 SHA-256: ace282c6225c49d4b63a9024ed4fa9db87da435036fcc6a9a35baf7a1606409e
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 are to obscure domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/pbw?utm_term=luces+del+tablero+de+un+carro+significado
    • https://cdn-cms.f-static.net/uploads/4387939/normal_6017fa59cad23.pdf
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/zinomop.pdf
    • https://rotowoboragidak.weebly.com/uploads/1/3/4/5/134508058/kukibisopatisalefur.pdf
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6037fb08d610d.pdf
    • https://bibitoxi.weebly.com/uploads/1/3/4/6/134653780/e577911.pdf
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ffc9f36c4563.pdf
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/20407e91bf428.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6dd6ca7f-bc3c-4589-ab7a-657b214f428f/xevunireluboxif.pdf
    • https://uploads.strikinglycdn.com/files/7641a9b9-e12f-4007-b81f-2ae89c3ef6de/resumen_del_libro_porque_fracasan_los_paises_capitulo_7.pdf
    • https://uploads.strikinglycdn.com/files/857c1f1b-30f2-4bc7-9ed9-120fd41a0bfd/fedilo.pdf
    • https://uploads.strikinglycdn.com/files/8cf0c683-0349-46fa-a980-23d22c38e97c/fowozekinig.pdf
    • https://uploads.strikinglycdn.com/files/a3a85f71-bead-4e22-a32f-ea0fffc47e12/12497810714.pdf
    • https://uploads.strikinglycdn.com/files/fbcef145-5835-4ab0-9f80-42804f7cb051/software_architecture_books_2020.pdf
    • https://uploads.strikinglycdn.com/files/61df9188-15cc-46cb-af31-3fadf569feb1/51760763281.pdf
    • https://uploads.strikinglycdn.com/files/ce408fbd-5b6c-4854-8f44-1d4b67f6680c/royal_london_governed_portfolio_1_past_performance.pdf
    • https://uploads.strikinglycdn.com/files/9e440d3c-e0bc-416a-b447-088f240992b2/what_correlational_research.pdf
    • https://uploads.strikinglycdn.com/files/4cb66207-9a5f-472e-b178-b1a76cd84890/who_are_you_becoming_quotes.pdf
    • https://uploads.strikinglycdn.com/files/c054e062-b246-4b4d-acf5-ffd8f35c2f23/sadisilusesuxewowilijipe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea1.bin
8e89f1152fdd97b9a7d8df5afc043877c2bd02ce2dcb7926166b503876316579		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 5268 bytes
font_01_sfnt_off0000f09f.bin
dfff98f92105026a44d620c5a1edf86f8a8462545c1e6683747540af4be677a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 11060 bytes

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